Honeythorn
Sugar coating and nicely nicely? I don't think so
Yeah i'd probably just buy a divider but anyway i want a betta, 5 harlequins, 5 pgymy cories, i know they might not get on but i have my community tank to put them in if all goes wrong. Is that overstocked? I've already got a light. Also whats stingray a type of light or something?
You need more cories than that, they prefer bigger groups. Get 8-10 of the pygmies and leave out the rasboros. Putting the rasboros in with the betta and hoping they get on is really not kind to either fish. If the betta chases and nips the rasboros you will have to treat the subsequent injuries, and vice versa. All of which is stressful, time consuming and completely unessescary if you don't bother mixing the species to begin with and wait for disaster to strike. If you put all 3 groups of fish in a ten gal I reckon you really would be a bit overstocked anyway.