My 15 gallon tank is looking rather dull at the moment. I had to take out all the elodea because it wasn't thriving in the low light, and I'm waiting for the Java fern to grow sufficiently to make the tank look nice again (at the moment the planting is looking a bit sparse, so you can see all the ugly brown algae on the back wall of the tank!) Having decided not to try a betta sorority, I've been considering other options to liven up the tank a bit.
at the moment the inhabitants are:
5 glowlight tetra (which can be quite nippy)
3 cherry barb (which are very sweet and peaceful, maybe because the tetras keep them in their place)
I'd like to increase the number of cherry barbs, and maybe add a shoal of Harlequin Rasbora as well if possible. I'm not sure how many shoaling fish can comfortably live in a 15 gallon tank, though. I'm aware it's quite a small tank for such active fish, and I know from experience that overcrowded shoaling fish tend to start attacking each other.
mostly I'm worried that the glowlight tetras might attack any new fish I add to the tank, as they are quite territorial and need to establish a hierarchy among themselves. to the best of my knowledge cherry barbs and harlequin rasboras are peaceful fish, though.