I've read a lot about how hard it is to keep sharks. I originally wanted to get a big tank and a shark. Last time I was at the not so local fish store, I noticed that they sell Barracudas. They are about 4" long for $60. Does anyone here know the requirements for these. I assume they are probably similar to sharks because they are also large predatory fish. I probably won't buy one because I want a peaceful tank, but I wanted to know yalls opinion on them.