I think I responded to your thread in the main forums but for the sake of expedience: I have checked out a fair few online sites and they fail on 2 counts; firstly many of then give inaccurate/no information as to the final size of any given fish (particularly the ones that will grow really big like the common plec) and secondly a lot of them sell Parrot Fish which, I feel, is ethically wrong. I would suggest that if you need to use an on-line ordering service ( ie you don't have a halfway decent lfs nearby or the one you have is not prepared to order what you want, within reason) then you do your own research, don't rely on their information and please, please please don't order from anyone that sells (man made deformed hybrid) parrot fish.
ps The last part about the Parrot Fish was a personal plea, you can, and should, make up your own mind.