How fast do BGK grow. I bought 2 of them about a month ago and they've already grown an inch. They're currently 4 inches. They do not fight with each other and currently live with 8 angelfish in a 180 gallon tank.
There has been some success with keeping multiple BGKs, but be aware that they are really small right now and as they grow into the 180g, it may turn into a different story. They usually grow pretty quickly until about 6" and then they slow down.
Mine grew quite quickly from 4'' to 6'' in about 2 months,, Six months later and its still 6'' .. He is awesome.. You should post some pics of your two new BGKs
In a 180 they'll probably grow an inch per month up to about 10-11" then slow down, as long as you feed them every night. After that growth is in spurts. They will probably become intollerant of each other at about 6", and one could be killed if it is not removed. They can sometimes be kept in groups. They wont like it, as they are strictly solitary fish, but with just two one will almost definitely be bullied.
My bgk has grown from 4" since i got him in january about half way through to now 7.5" its freaky fast. Regular water changes and good food will help him grow.