i have got 2 4 inch long kissing gouramis, had them about 2 weeks, and if i g near the tank, they go mad dashing about, and bashing into the glass, jumping out of the water... why are they so nervous? my tank is 21 inches high, by 35 inches wide im new to all this so please help! is my tank too small, i know im gona have to get a bigger 1 , as they grow big!