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Water flow needs to pass through for ample oxygenation along with heat (as you mentioned) and even though they are being aggressive, if you want to pair them it's better they see each other.
Maroon clowns will sometimes not tolerate any other clowns in the tank, unless they are a mated pair. Remember, clowns are damsel fishes, and can be extremely territorial. Unless they are mated....I like only one clown per tank. (Maroon and Fire)
i dont know why you insist on buying fish if all your fish have ich. sounds like a bad investment, ich doesnt go away with just taking out the fish that have it. good chance your clowns will get it to
I haven't ever tried that.... Mine loves a variety. I feed him Dried Cylop-eeze (which he loves), and frozen Mysis, reef plankton, cyclops, and I like the Frozen Saltwater 4 pack by San Francisco Bay.
Do not feed live foods if you do not have to not to mention that guppies/feeder fish eventually cause liver failure in the long run. As nonluvr said, feed a variety of food such as a mixture of nori, mysis, krill, fish/urchin roe, fish, shrimp, etc. There are plenty of food mixes at your disposal if you Search for one