Crushed Coral 1 Pound

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  • Raises pH
  • Increases KH to Buffer pH
  • Adds Some Hardness to Water

Crushed coral is a great tool for raising the pH of your water. We use it at 1 pound of crushed coral per 10 gallons of water when mixed in with our gravel. Crushed coral dissolves continuously over time. The lower your pH is, the faster it dissolves. As the pH rises, it slows down how fast the coral dissolves. Crushed coral adds a bit of hardness to the water and it significantly boosts KH which buffers pH from swinging.

Customer Reviews

Based on 279 reviews
David R. (Palm Bay, FL, US)
Crush Coral

Works great how's my pH level

Paula I. (New Rochelle, NY, US)
Crushed Coral

Since I had a problem with my pH level and didn’t want to use any chemicals, I decided to use the crushed coral and now the ph is at a safe level?

Shay H. (Charlotte, NC, US)
Crushing it with Crushed Coral

Had struggled with low pH for a long time and went through a move. My new home's well water is very soft from the installed softener obviously and needed me to put something back in. Very low KH, GH and pH from my faucet. Did a lot of research and the Co-Op videos helped so much! I added about 1/4 what was recommended in crushed coral to my tank, afraid of doing too much too fast. Well it turns out low pH water (6.0) will devour that coral quickly and my pH is hanging out at ~ 7.4 after only a few days. My KH and GH values have risen steadily and my fish are as happy as ever! Now I have a solid way to buffer my pH. I'll need to add more crushed coral sooner than later, but I won't be afraid to add the recommended amount seeing these results. The YouTube videos have been incredibly helpful for me to better understand my tank. My fish and I thank you!!! My plants too!!

Luis M. (Atlanta, GA, US)

Crushed Coral 1 Pound

Lavina R. (Chambersburg, PA, US)
Crushed Coral 1 Pound

This is a great product. We purchased the crushed coral for all 4 of our aquariums. It does a great job. We love Aquarium Co-Op. They have helped in many ways as well as having great products.