garnman,
for what it is worth. I started my reef off in a 3 gallon. I had some
LR, a couple of zoos, xenia, a
BTA, and a clown. It did really well for about 3 months. The hard part is if there is the slightest changes in any parameters it really hurts the tank. It was also hard to measure supplements, additives, etc (try to measure lugols
iodine when 1 drop is for 20 gallons and you have to split 1 drop down for a 3 gallon dose). There is not much room in a small tank to move things, clean, adjust, etc. I moved the 3 gallon up to a 10 gallon as I had more $$. The tank did well and as I added
LR & species i finally upgraded to a 40 gallon.
So you can start small and work up but it is nice if you can just go big. You will have to take your time as you move to a bigger tank (acclimation, cycle, testing, etc.) The nice thing was to learn on the small one and purchase things like test kits, foods,
LR...things you can use on the big tank and then your $$ can go towards species.
just my 2 cents.