So I am almost sure most (if not all) aren't "real" sharks, but I am still interesting in getting some... but I am clueless excpet for knowing that bala sharks need a big group and HUGE tank to prevent glass bashing or whatnot. What are some good species that can be had in, maybe a 150 (or smaller?). Are there any that can happily coexist with other fish groups? Any suggestions on maybe a website or book so I can look them up more easily to get info on them? (it's hard to google sharks and not want the marine ones, and I don't know many names to look them up individually).