I was thinking of replacing my inert gravel with one of these in my 12 gallon. Does anyone have a preference? I have heard a lot of good things with Eco-Complete. The Flourite bag come in a 15lb bag and the Eco-Complete comes in a 20lbs bag I believe. There is only a $5 difference though so I don't really care. I also tend to like Seachem products for fertilizing so I'm at odds with myself, but might be leaning toward Eco-Complete. Anything else I should know about using this type of substrate? Does it affect my fish or stocking levels? Should I use fertilizer tabs or liquid fertilizer just the same as before (currently use flourish complete, iron, and excel)? I have Low light plants: anubias nana, a java fern, an amazon sword, anacharis, wisteria, and some corkscrew vallisneria. Trying to get a hold of some cyrpts or java moss. I have an established tank and want to take out my inert gravel and put in the new substrate. Will this mess with my pH levels or water quality? I figured I would take all my plants and deco out, and about 1/3 of the water, and leave the fish in (or not what do think?) while I replaced the gravel.