Hello, I bought a 28 gal./110 litres tank. I have already a 8 gal./30 litres tank, set up as a nanoreef; there is a couple of sexy-shrimps (Thor amboinensis), a pigmy yellow sea cucumber (Cucumaria sp.), a boxing crab (Lybia tessalata) and one sea snail (Turbo). There is also some Discosoma sp., klyxum, Litophyton arboreum ***... I want transfer all the animals from the small tank to the 28 gal., but I want put some adds, mainly filter organisms (as live sponges, ascidians etc...), Echinoderms (a Mespilla sea urchin and, maybe, a sea star) and some other Crustacea (Enoplometopus debelius, hermit crabs). I've read the Tyree's books, but I don't know what are the best for myself, and how I can keep together! Tanks