I have 9 fish including two blue gouramis. One male and one female. (I have no idea if this has anything to do with the algae pellet or not...). Today I put an algae pellet in the tank and the male gourami turned into a bully! He was hogging the algae pellet and for the next few hours nipped at and chased the female. And also his color changed this afternoon. He is darker grayish with brighter blue spots on his tail and bottom fin. I swear his color changed today. They were the same pale color this morning. Any thoughts??