stingrayguy;1554635; said:Ive never thought much of turn over rates. Right now my large pond with 4 rays. Has a turn over rate of 1.5 per hour. And I have 3 prego females right now.. When I first bred rays. I had a 210 gallon tank with a 300gph pump. And they had bred in there. Wet drys work better the longer the water can "touch" the bio land