well its a 10g tank and i had to set it up with all new saltwater and i didn't want to use any of the liverock from the main tank. main reason is that i am still not sure if the main tank is safe yet, i had a bad parasite outbreak about 3 weeks ago, and i read it can take up to 6 weeks for the free floating parasites to die off. well basically i use one of those gravel siphon things to siphon up any waste or leftover food, and i can usually get it all in a gallons worth, so then i just make a new gallon of saltwater and put that in. the filter is an aquaclear mini with a sponge and carbon bag. i also have an airstone and some fake rock for the fish to hide in. i wouldn't mind putting him in the main tank, but i just want to make sure the parasites are gone. it is a red scooter blenny btw, about 1-1.5 inches. thanks