I have used an aquaclear sponge to put on the intake when breeding freshwater fish. I use a fillet knife and cut a slot inside in an X pattern and slip it over the intake. It works well to keep the fry out of the filter. As for the feeding issue, I used tetra tropical tablets http://www.tetra-fish.com/sites/tetr...id=1276&cid=28 They are almost powdery in texture once they dissolve in water, and they sink so you can drop them right into the group of fry. Not sure weather or not this is proper nutrition for clowns, but it worked well for my flowerhorn wigglers untill they where free swimming and able to chase down flake food floating around the tank.