Okay, you guys seem pretty clued up so i'll tell you how my mate has his going and tell me what can (and will if need be) go wrong etc.
3' tank, standard 30gal with a single filefish, a few native crabs. Gravel and sand collected from the beach where he caught it. At first he used sea water from the ocean, and then started to change to tap water by water changes. He has just got honeycomb rock in it, and runs a fluval 303 (i think) canister filter. His salinity is at 1.024 and a pH of 8, a temp of 14-16C.
I want to do something like this, with a 2' tank, but a little different.
Instead of an external canister filter with filter media, I want to do one with LRR. I also want to use proper live rock from the rock pools and stuff, that has been quarintened free of nasties and stuff. And add some native sea grass and stuff, make it look all good. I will also have a light on it, a blue one. I'm not growing coral so it doesn't need to be very high, but the light won't be weak either. The substrate will also be coral sand or silver sand.
What do you two think? What could I do better. I don't want to add huge extras and stuff, only stuff like the essentials.