Not too bad. Tanks are cheap...$1 per gallon therabouts. If you want to see some awesome scapes, check the site I mentioned earlier. I teach Science(chemical,phys,etc), so I really get into keeping the correct husbandry parameters for each species...flora and fauna. Price comes into it when you decide to go "high-tech"...injected CO2, dry fertilizers, pH, sheeesh I'm drooling just talking about it.
Don't get me started, I may even tell ya about my dwarf shrimp colonies.
"Science Rules!".....Bill Nye