I created a cool 20 gallon brackish tank that's half-land, half-water. Right now There are 3 mollies and 2 fiddler crabs. I want to get one more fish and I'm trying to decide between a puffer or a mudskipper. If I get a mudskipper I will get the smallest type, the vietnamese mudskipper. If I get a puffer I will get the most likely to be peaceful, the figure-8 puffer. Are there any obvious problems with either of these choices? I like the personality of the puffer but I just created so much land space I feel like the mudskipper would really enjoy it. I know both are risky, but I work at a pet store and my girlfriend has a brackish setup as well so I have lots of options for what to do if problems arise. I'm just wondering which of the two carries the least risk. Thanks!