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Crushed coral is a great tool for raising your pH. We personally use it at 1 pound of crushed coral per 10 gallons of water when mixed in with our gravel. Crushed coral dissolves over time continually. The lower your pH is, the faster it dissolves. As the pH rises, it slows down how fast the crushed coral dissolves. We find that Crushed coral may need to be replaced every 1-2 years depending on how low of  a pH the tap water is. 

Crushed coral adds a bit of hardness to the water but not much. It does add a lot of kH which buffers the water from pH changing.

 

When using it in your filter, crushed coral will dissolve faster. This means you'll usually use smaller amounts but replace it more frequently from to 1-3 months being most common.

Crushed Coral 1 Pound

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Crushed coral is a great tool for raising your pH. We personally use it at 1 pound of crushed coral per 10 gallons of water when mixed in with our gravel. Crushed coral dissolves over time continually. The lower your pH is, the faster it dissolves. As the pH rises, it slows down how fast the crushed coral dissolves. We find that Crushed coral may need to be replaced every 1-2 years depending on how low of  a pH the tap water is. 

Crushed coral adds a bit of hardness to the water but not much. It does add a lot of kH which buffers the water from pH changing.

 

When using it in your filter, crushed coral will dissolve faster. This means you'll usually use smaller amounts but replace it more frequently from to 1-3 months being most common.

Customer Reviews

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R
R.
PH bounceing

Had a tank with dropping ph and got this to try a slower more long term fix. Seems to have worked as ph has stabilizedafter a week or so and will be order some more to keep on hand just in case. The price is amazing so if you having problems with super low ph it won't hurt to give this stuff a try!

T
T.R.
Snail Cure

I got this for my two snails, as my water is pretty soft and I was worried about their shells getting enough calcium. After about a week, the one snail who I was most worried about looks to have a strengthened shell and the other one is doing great! Make sure you rinse it out thoroughly, otherwise there is a lot of dust. It comes in a double packaged plastic bag so no worries about breaking open and making a mess, there are some whole shells in there so you know it is truly pure crushed shells/coral.

C
C.C.
Crushed Coral

After bringing in a sample of my aquarium water for testing, I found out I need to raise the ph. Conveniently packaged, these crushed coral bits fit into a mesh sleeve, also sold in the store. I placed one in my AquaClear filter media bucket & voila! Happy fish!

A
A.
Hard water but...

My water is very hard, but it's mostly iron, very low on calcium which becomes apparent in my snail's shells. This makes a nice addition to the substrate and helps the snails and shrimp.

J
J.
Arrived super fast ~ I am very pleased!

Arrived super fast ~ I am very pleased!