Its a 75g, and the aggression is pretty much kicked the bucket they eat nori next to eachother off the same clip, sleep together I guess it was just that first initial hour together my kole did not like him, and I know yellows arent supposed to go in this small of a tank but everything is going smooth and i'm definitely going to get him a bigger tank sooner or later, that is a given.
Glad the diet is on the right track, I feed mainly hikari pellets, and mysis with a healthy pinch of spirulina every so often, and of course replenish the nori when need be.
About the puffer I know where you're coming from I've seen puffers be super aggressive and little nippers but this fella is so nice and relaxed all he does it follow the yellow!
the yellows fins are for sure healing I can see a difference day by day.
Honestly I think the puffer is the most docile in my tank atm haha. Ill post a pic of the yellows fins tomorrow, to show some progress, he is definitely getting a belly on him now too.