you know tom i have to hand it to you. these clams are so interesting. i might need some more. i swapped my gravel to sand and in that process 2 of my ac110 got clogged. so the water was like really brown and nasty. i threw in the clam and within 30-40 minutes water was like clear. lol. didnt expect to happen like that but im gonna pick some more up when i go pick up some clown loaches from you. water so clear its like im running 2 fx-5's with like a 60 gallon sump. lol. im over filterating with these clams. lol.