It's very easy and cheap to hardscape the small tanks. My minibows each have a tiny piece of driftwood with a java fern attached to them - and it give the fish (a betta in each) a place to hide behind if he wants. My 1.5g tank has a small rock with a java fern attached to it. If you're not doing a hardscape because you don't want to that's fine of course, but all you need is a little bit of imagination in a small tank. Heck even a piece of terra cotta or a cheap little store bought item like a shot glass can be covered with gravel and plants to make a nice piece of decor.