I am setting up a 125Litre (roughly 30 gallon) tank, it will have 1 dwarf gourami, 1 male betta, 13 pygmy corys, without the rams you could have 2 more Pygmy cories 12 boras briggitae, 8 or if you don't want 2 more cories you could have 3 more micro rasboras galaxy rasbora Galaxy rasboras should ideally be in lower temperatures compared to fish like bettas and gouramis, a better choice would be 8 hengals rasborasand 2 bolivian ramshaving rams with a Betta and a gourami is trouble waiting to happen, and I would also watch out when the rams are fully grown as your micro rasboras might start to disappear , it will have 2 filters. is that too much and do i need to change the quantities???