Hi new to site got a 50 gallon tank going with some neon tetras as my first fish introduce to the tank. Got a eheim filter n heater going too. Put some amazon sword n a Brazilian type plants going on with a piece of drift wood. Hoping to build a nice little community of passive fish. Had problems with a hi fin shark in same tank tht got out of control lol. He ate 7 of my fish had to take out all decorations n plants came it seem to freak him out as he got bigger .