07-11-2007, 03:35 PM
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It's just a comment, but I once had my new fish, tetras/Otos/Dwarf Gourami, in a 16g bin made up of the larger sized gravel you have lying on top of your other substrate. I have to tell you - I think you're not going to enjoy the outcome. It does a terrific job of trapping food, so the fish can't peck at it, and letting it fungus/deteriorate, and it's very tough to clean fully. I kept having .25ppm and higher levels of ammonia coming from supposedly nowhere - even though this 16g bin had nothing but an immature dwarf, 3 immature neons, and 2 near-fry Otos. That's hardly a bioload, for 16g.
If you like the look, you might leave an area where it's collected together, where you can siphon extra attention, but across the whole tank, it may be a cleaning problem, and an ammonia/nitrate factory.