i would say he/she would be fine as long as it isnt to small to fit in the BGKs mouth. i just got one from petsmart last week and it is probly 1.5in and has to be in a 10 gal comunity tank... they will eat whatever can fit in their mouths... but on the contrary i have 2 senegalus in a 65 with 4 1in clown loachs, and they havent eaten any of them, and the bigger polyp is hitin the 5in mark and his mouth is plenty big enough to eat the clown loachs. wouldent worry about the angels. and i dont know about anyone else, but i havent had any agression out of my polys exept at feeding time, they cant quite figure out that the food is dead...