On my 75 Gallon tank, I had it fairly heavily stocked with African Cichlids, so I went a little overkill on filtration, but IMO, it's better to overfilter and have some redundancy than to underfilter. I had a Marineland C-360 Canister filter. It was an EXCELLENT filter, quiet, efficient, and it was easy to tell when to do maintenance on it, because flow decreased dramatically. The design allowed for virtually no by-pass which is a good thing in a filter like that. In addition to the C360, I had a Whisper 40 (I think?) that I had to trim down (there's a depression where the inlet tube hung down) so it would fit over the large lip on the 75 gallon. I also had a powerhead with a sponge filter that kept the bottom "stirred up." IMO, redundancy is your best bet in the case that something fails (and it inevitably will). I also had 2 heaters. Also, using 3 different sources for water movement and filtration allows for the ability to "tune" your setup to reduce accumulation of poo. I didn't have any poo settle on the sand. Laurel _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member