Jus a lil question, is it beta to have lots of things in the tank, ie, rocks, plants, boats, rocks with holes, other stuf that fish can hide in , better for most tropcial fish or bad? i have 5 tetras in a 37 ltr tank, quite a smal tank ? they seem to be always exploring and hiding in the gaps at times and other times swiming around at the midle of the tank?