A friend came back from Mexico. She went to an aquarium and is trying to identify a fish she saw (there was no tag on the tank). It is likely a box fish of some sort. It's a wide-bodied, lime-green fish. About three inches long. No horns. Its fins do the fast fluttering you see in a puffer or other box fish. It had spots that were almost indistinguishable from the body color. The most striking thing about it was that its eyes were electric blue. There is no good picture of this. Any ideas?