yet more questions lol, sorry for all these!! just wanna try n do things right

a few weeks ago, i found tiddles, a titchy baby dwarf puffer swimming bout in my dps tank. at the minute, hes in a little floating baby tank thingy, but hes growing so i dont wanna leave him there 2 long. what i wanna know is if i put him in the tank with the 3 dps that are already in there, will they accept him, or would he get bullied etc? i have got a small tank i could put him in instead if thats a better choice, but if poss i would like him with the others.anyone got any advice on this?
cheers