I'm new to all this stuff, but I must learn quickly. I would like to begin by saying first I have inherited about 5 rather large fish. Three are kissing fish about 7 inches in length, one is a shark that's about 8, and an angelfish that's like 4 tall and 5 wide. Now, I have many other things in the tank, a newt, a snail, a frog, a blue gorami, and so on. I was told this would not be a good setting for a betta male at all, and he and the gorami would supposedly clash. Well, I picked out a lazy looking betta, put it in, hoped for the best, and the best happened. They see each other, they don't care. The betta sees the angelfish, doesn't care. "Neat" I thought. So I went to the cichlids, heard they were aggressive too. Picked out a docile one, no clashes still. Not even territorial shoves, just smooth sailing. So I'm thinking of getting a puffer, Ceylon, dwarf, and several others that I've read are docile (not of getting more puffers than one, but one of those several puffers). I know that this will depend entirely on the individual puffer's temperment, but I do well in picking nontermperamental "aggressive" fish. I know they might be moreso than say, a betta, but, I figured the bigger fish already there would help, as they did with the incoming aggressive newbies. I am deadset on some puffer, now which would be best?