The white tips are on the ventral fins and have been for quite some time. On the other fins, excluding the pectoral fins, white stuff will appear.. And go away.. It usually doesn't last long at all, so I've been thinking it was just slime coat coming off. He's not as active, but he's more active than he was in the mini tank. Maybe, he'll get more active once I get more cover for his tank. It looks kind of bare in there, honestly.. =[ I'm sure it makes him feel insecure, and he probably doesn't want to move much and draw attention to himself when he doesn't have much cover. Maybe?