02-13-2007, 01:32 AM
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Eco and Cories is absolutely no problem. I have cories in my planted tanks with Eco, and they are doing just fine.
Also to add, from reading the original post, a single 2L bottle DIY CO2 will not be enough for a 55G or 75G. You would need at least 4 for good CO2 levels, or you might end up battling BBA.
And yes, if you don't stir sand, it will compact and suffocate the plants roots. But from what I heard, if you have crypts, they do fine is sandy or muddy substrates, where other plants would not survive.