Errr... I must have missed this before, but you're keeping an angelfish in a 15g? They can get quite big -- over 6 inches. They need about 30gallons. Sorry I never noticed it before. Maybe something else... if you get the flame tetras I would suggest a male Betta. You would have to be careful witht ht platies though, and be ready to move it. It might work out though. Worth a shot, I think.

I already have a honey gourami in my other 29 gallon so I guess I pick angel fish... 
