Hmmm, that seems like quite a lot. How quickly are you upgrading your tank.
I'm pretty certain kissing gourami's can get quite big.
Also what type of plec is it? If it is a common they grow to be beasts? and if it is a common your tank is definitely too small, and would need to be upgraded ASAP.
Not trying to get on at you, just trying to help
Edit: Aphotic Pheonix beat me to it = )