Go ahead with the EBJD. Due to their inbreeding it'll be unlikely to grow all that big let alone live past 4". Keep the water pristine and you have a shot. Due to their popularity they seem pretty cheap now. The one I had was really interactive and fun to keep till his genes got the better of him, made it to 3.5" and just went to pot. They grow really quick to 3"+ too. If for some reason you get super lucky (like powerball jackpot lucky) and get one that has great genes still you can either upgrade the tank or sell him off. A 6"+ EBJD is worth some cash and start over. This may sound cold, but they are short lived for the most part anyway and there seems to be no stopping the availability of fry.