I must have forgotten to mention that these guys are hatchlings, and I will be moving them to a larger tank when they get bigger. the reason i asked the filter question was so i could recycle the filter once i get a larger tank. I understand that alot of people keep their RES's in tanks that are way too small for them. But im not one of those people. they have a 220gal waiting for them as soon as i get out of the place im in now.