Since I have heard so many praises about koi clay, I decided to buy some from Bonniesplants.com.
That stuff is amazing! You can use it for a few different things. It makes your pond/tank water clearer. I never thought that that is possible, to have even more clearer water, but it was amazing!
You can put it in with your water plants as fertilizer. Just mix it in with the soil or other substrate you are using....
It can go into the filter to help along the bio bugs.
And you even can add it to your homemade gelfood! It enhances the fishies color like nothing else!
His ingredients are calcium b.....(something, sorry, I through the package it came with away), and you can find more info about koi clay on Bonnies website.