I have 2 oscars, 2 jack dempseys, & 1 large pleco in a 100 gal
. tank right now. I have an XP2 and an XP3 running along with a sponge filter rated for a 75 gal
. tank. My tank is crystal clear, but I don't think I could reduce my filtration in that tank. My pleco is the messiest fish in the tank. He's about 8 inches long. However, I am very happy with my filstars performance. I got both of mine on ebay in new condition. My XP3 cost me $90.00 including shipping. I highly recommend them.