Adding More Fish

[unknowntbeast]

I have right now 11 fish, 2 dwarf Gourami, 2 Molly Lyretails, 5 Zebra Danios and 2 Platies all in a heavily planted 20 gallon tank, enough to keep all readings at 0 ppm. In total 12 ribbon plants from PetSmart. I have a Hagen AquaClear 70 Power Filter (see below link) with the sponge filter as a guard since it is too strong for the Danios. But the issue is I only have 1 Neon Blue Dwarf Gourami and 1 (don't know the exact name) orange dwarf gourami, Flame Dwarf Gourami I believe. Should I go and get another 1 of each? The latter does seem to be more aggressive towards the Neon Blue Dwarf Gourami.

http/www.animalworldnetwork.com/aq3pofi110v.html

 

[Wills]

I wouldnt get an other of each, both are just different man made strains of one species of fish. If one is dominant that is likely to be a male though the other could be a sub male or a female. If both your fish have long dorsal fins they are both males but if one has a long one and the other is noticeably smaller you have a male and female. Ideally you want 2 females

 

[OldMan47]

Both of the brightly colored dwarf gouramis are males, the females are just a basic silvery color. More male dwarf gouramis in a small tank are a terrible idea since males do become territorial.