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My 20 gallon tank had an under gravel filter when I first started it years ago. A few years ago I just stopped running it and relied solely on the hanging-on-back filter (not a smart thing I have...
Hi to all. I have lurked a little on this site and have been impressed by the wealth of knowledge here! I have a 20 gallon tank which is underpopulated at the moment; I hope gain some knowledge...