Well, either Fritz started diluting their Maracyn or decided that that it needed to be given at a higher dose than in the past. Here are some facts. The last bottle I purchased right here on Aquarium Co-Op says right on the front label Net Wt. 60 grams and right next to that it says Treats 1,000 Gallons and on the back label it says “Add one level scoop (approx. .6 gram) per 10 gallons of water.” A little math says 60/.6 = 100 scoops x 10 gal. = 1,000 gallons, the older smaller scoop per D.B.I.'s observation. All the math works. Now let’s jump to the new size of 100 grams: Net Wt. 100 grams, Treats 1,000 Gallons (what, use more for the same gallons??), so now it takes an entire gram to treat 10 gallons of water where it use to only take .6 grams, thats a 67% increase in use of medicine. Then look at the 400 gram container: according to the Co-Op web site Net Wt. 400 grams, Treats 4,700 Gallons, which if the Co-Op site is correct then this would be a ratio of approximately .85 grams/10 gallons which starts to make sense with what D.B.I. noted with the scoop being 1.7 cc except that the scoop would be good for 20 gallons not 10 gallons (.85x2=1.7). (It should be noted here that Fritz says that 1cc approximately equals 1 gram of the powder.) but to go from .6 grams for 10 gallons to 1.7 grams for 10 gallons would be a 283% increase. Something is way off here. It needs to be noted that other sites selling the 400 gram bottle, they say that the 400 grams treats 4,000 gallons which is the same ratio as the new 100 gram bottle. Also, on the D.B.I, post he shows the back of the bottle label and assuming that is the 100g bottle it says that Each Dose Contains 200 mg Erythromycin Activity which is the same as it says on my older 60 gram bottle, so did Fritz change the dilution of the powder so that the new larger scoop still contains the same amount of active ingredient or is there a mistake in the scoop they now include or are the instruction incorrect? Lots of questions, what I do know is that the .6 grams to 10 gallons of the older bottle works just fine. So, it appears that both the Co-Op and the Fritz company have some explaining and likely corrections made to the website(s). Photos of the 60 gram bottle which only expired 04/18/2024, so not that old of a bottle. Do your homework as the jury is currently out on this product as to the correct dosage. The low rating is not for the product itself or to the Co-Op, but for the lack of correct instructions.

Summary: Aquarium coop is great. The product itself is great. I am upset that I overdosed my tanks because Fritz changed the size of the scoops that come in the jars.

I ordered a jar of Paracleanse and Maracyn (due to an outbreak). I followed the instructions: "1 level scoop (1 gram) per 10ml". The scoops looked larger than i remembered. I found an empty jar of Maracyn and the old scoop is 1cc. The new scoops that came in the jars are 1.7cc!! See pictures. The directions on the jars have not changed.
So I overdosed 6 tanks and I'm doing water changes tonight.
BE CAREFUL! The bottom of the scoops will say how many cc's per scoop (1cc = 1g).

On day three my tank is having a crazy reaction. All fish/snail inhabitants seem fine but it is destroying my floating plants. Not a huge deal, I can get more. I will say it does appear to be helping my betta heal. Just a bummer my tank grew.. webs? As a result 😂

Followed the video on the triple combo of quarantine drugs on my new fish and I haven't had any dead fish to date!

It worked... I used on blue green green algea with good results... I used it on an injured/ infected angel, it's eye was terribly grotesque looking, but she's happy and breeding with her new mate...

While I'm in the salwater side of things, I still very much enjoy and value Cory's knowledge and opinion on the products you guys sale and videos posted.. This item and the quarinte trio have saved me from alot of heartache. Eradicated some finrot after two treatments on my clownfish. Will be buying again.

Let me start by saying I love Cory and the coop and 99.9% of the things they sell but unfortunately the Maracyn didn’t seem to do anything at all. I have 1 discus out of 5 with fin rot and did 2 rounds of treatment following the directions to a tee. I did not use the med trio because he doesn’t have any symptoms of anything else...he’s active and eating well. He doesn’t hide or have clamped fins and his feces looks brown and normal. I gave this product 2 stars because while it doesn’t seem to have helped, it also didn’t do any harm to my fish and it didn’t foul the water. I posted a picture below. If the coop has any suggestions I’m happy to hea them.

I purchased a blue ram from Petco a while back. Died on me, it got sick, and took 2 of my platys with him. From the beginning I noticed he was not active. So I decided to give it another shot and I got the quarantine trio, quarantined my fish and after a couple of weeks put him in my show tank. You have to believe me guys he is one of the most active fish in my tank and is glowing waaay more then when I first got him. He's looks chunkier and happier after the meds helped him. I looked on Amazon and couldn't find a better price for these products.

I had black slime algae for a long time, it got increasingly worse until it was getting out of control, no matter how I cleaned my tank...I researched and found Maracyn and it had great results from reviews...I purchased it and was fully expecting to have to do more than 1 treatment since my issue was so bad...however, after just one treatment and a 25% water change, I haven't seen any signs of it returning 3 weeks later...I have neon tetras and zebra danios, and it didn't affect them adversely at all, in fact, they seemed to me to be perkier after the treatment...I highly recommend this product!!

a combined treatment of this and ich-x save my betta from a potentially fatal case of finrot that progressed almost faster than I could cure it. Only a week after treatment and hes already starting to grow his tail back. I even flowed the instructions on their YouTube video about curing finrot.

Currently have 9 tanks up and running, This is the best Combo of meds in one shot , fixes several problems. MUST keep on hand at all times .

I have a 38g tank with an assortment of fish, including a peacock eel, upsidown catfish, a white non albino rainbow shark, sunset garami, a red mouth cichlid, as well as 2 longfin L144 piecos, and snuck in one Bolivian ram and another regular rainbow shark, i have plenty of hiding places fyi so no worries on the fighting everuthing gets along oddly great, after chances here and there but nothing longer than 3 seconds. Any ways I used the med trio minus the the ich x, as I was confident it wasn't ich because a period salt treatment ove ra month and half and constant temp at 82, i digress. I treated exactly what it recommended because I've been dealing with this weird fin /body / slim coat peel going on that the med trio prio did not fix and neither did an aggressive amount of salt treatment. Knowing this was a very strong.. whatever it is
Almost a wasting disease but the cells do not match that of that disease. I can safely say I think im now over and it has been wiped completely out of my tank just falllow the directions on the box and you'll be okay, one fish did pass which was a German blue ram but he was really far gone already when I started entirely. I give it 5 stars because it was able to save 90%of my fishes lives. And they threw in a really cool sticker which helped me feel a little better what was going on in my battle with this fish plague of almost 2 months , now I can go back to sleep and stop twitching in the corner staring at my fish.

As advertised , quick shipping great product and great price

I always used API's erythromycin until Corey started offering this. As always with new things I like to do my tests. I've been quarantining discus I got shipped in. I personally think it works better than API's and it's heck of a lot cheaper. ( Excuse the water marks in the picture)

Bought this to treat Cyanobacteria in my Dwarf Puffer tank. The recommended 5 doses demolished it.

I have nothing but good things to say about this company! Haven’t used/needed yet but wanted to have on hand for a basic “Fish First-Aid Kit” and it arrived sooner than expected! Great customer support!

Works well

Excellent service

Thanks you

Used for treating cottonmouth in 5 gallon hospital tank for newly arrived honey gourami. Effective with 5 day treatment, have them isolated for an additional week to watch for reinfection before returning to community tank. Caught early and has been effective.

Great product! Long shipping time, but regrew my betta’s tail!