Out all the different types. Which is usually the least flaky, I am looking for something that is not going to fragment all over the bottom of my tank.
Honestly the fiji and FL rock that I have seen have both been fairly unflaky. Now if you go banging on it with a hammer or something chunks will break off but it wont flake off in thin layers or anything.
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__________________ Remember dont tap the glass, your fish will think you're an idiot-Anonymous mother