Did it look like that particular gouramy was being chased or attacked by another one, on a regular basis?
For example, when feeding time occurred, was it able to eat without being harassed?
I haven't seen it being harassed, but who knows. I see the other 3 gouramis chasing each other occasionally . This particular gourami has been staying in the mid-to-bottom part of the tank mostly. I have seen that whatever food it can get is the food that drifts close enough to it.