Ok so something I keep forgetting one of my pumps I had to take out after it ate two of my koi, it doesn't have anything over it and right after I had put them in(like by the next morning) I started noticing missing fish. Finally I found one dead stuck to the intake area. I didn't remove it til I noticed another missing fish and found this one the same place. So now I need any possible suggestions for putting something around it that might help with prefiltering it also. My plan for now is to have one of the pumps go to the bog(which will be the big boy/fish eater and the other go to the waterfalls. My husbands told me I should keep them in the same area otherwise one would overpump the other and cause issue with one side being too empty and the other overflowing. Which wouldn't be good. Any ideas on what to use to keep the fish from getting stuck I know some sort of filtermedia that could sock over it would probably be ideal. I have some that are round that went to my saltwater tank but they aren't big enough.