Ok so today i just bought 6 glo light tetras and a dwarf gourami who are currently in a 12 gallon quarantine tank. The largest 1 of the 6 glo lights is acting really strangely. He/she is not shoaling and is racing around the tank for no reason and is bumping into the walls and going under the sponge filter. What is wrong with him/her?! The other 5 are shoaling and happy and the gourami seems to be acting normal.

Sounds like its more scared than the others. Give it a few days to calm down.

well...last night he died. I just got back from petsmart to exchange him for a new one...I hope the qt isn't contaminated now...