I have a planted 36g with a pearl gourami, soon to be 6 rainbows, 4 cories, and an upside down cat that I never see. I just lost my last bolivian ram. Could i add and apisto pair or would I be overstocked? I can never find any cool ones where I'm at but Twofishguyz.com sells pairs. My params are ammo 0, nitrite 0, nitrate way less than 20, ph 6.4. My water is soft but I don't remember the exact value. Any recommendations would be greatly appreciated.