i have a 36 gall bowed front. in it are 7 fancy guppies , 4 bleeding heart tetra, 2 kissing gourami, 4 schwartz cory,2 peppered cory, and 4 panda cory all of which are staying i n abig group(the cories not the other fish. i was thinking of adding acouple of golden rosy barbs. too much?