Axolotls wont attack certain tropical fish

Axolotls will not attack the green fish with blue stripes. It is the only one so far it wont attack

 

Steps to reproduce:

1. Make a tank
2. Add axolotl
3. Add the blue and green tropical fish and a random fish

 

Observed results: axolotl will not attack the green and blue fish. But will attack the other fish.

 

Expected results: Axolotl will attack both fish