jmacavali
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I had a 55 gallon freshwater tank. Had 3 filters (2 "over-the-back" kinds and 1 under the stones) & 2 heaters and several air pumps. I had up to 15-20 fish in there at a time. I never had any problems. I had fish that lived for up to 2-3 years at a time. I didn't do any massive water changes or anything. I didn't add any special chemicals or anything either. I just kept the filters clean. I had a pleco in there that was at least 4 years old and we think older than that. He even survived a move. He was about 8" long or so.