03-05-2009, 11:51 AM
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I have been told that if sand depth does not exceed three inches that gases (hydrogen Sulfhide) are less likely to develop. Some claim that the sulfhide reacts almost instantly with oxygen in the water and thus has little chance of harming fish. As for me,, I have around an inch of sand in 29 gal along with corys and trumpet snails who both do an excellent job of sifting the sand yet, I still sift through it on regular basis with plastic fork. I don't believe everything I hear and it gives me peace of mind to know that there is no chance of any toxins building up in dead areas harmful,, or otherwise.