Glass Cardinal - Problems?

[GoFish]

Tank is 46 gallons. 1 of them was bought about 8 months ago and then the other 2 were picked up about 4 months ago. The 2 more recent additions stay very close to each other and the third seems like a 3rd wheel. Damage from fins could be from fighting i guess, though I've never seen any aggressive behavior by any of them. I was mainly concerned about a disease that I should be worried about. The Glass Cardinals at j+l show the same random fin damage as mine, maybe just how they are

Just watched a YouTube video of a Banggai make holding eggs in its mouth, it looks just like that!

If there wasn't a Scribbled Rabbitfish in the the tank then babies would probably survive for a little more than 10 seconds, but he's a pig and eats everything including poop...