ok today i got 4 new pets! i was really excited. i need some help with names.

1. Fiddler Crab, moves a lot, yellow circle on his/her back
2. Fiddler Crab, stays in one spot, smaller than first one
3. Fish, white with orange and black spots, fan tail
my bro named the last one midnight because its black.
if you have any suggestions for names please tell me! thanx