Honestly, if you look at all the comm with aimara there's a lot of fish in them, I think a key to it is having a number of fish so that no single fish is getting all the aggression. Like right now I'm finding this problem with my curu, I have a sun cat and odoe with him, these are the only two he shows aggression towards, but the thing is the odoe stays towards the top and is about his size.. The cat is fairly active but stays on the bottom sometimes and is only about 8" but thick, so he's seeing a lot of the aggression right now. My curu isn't outright looking to kill him, they lay next to eachother sometimes, I'm really not sure what triggers his aggression. He's a character lol. All wolves are generally similar, just different size scales. So as for tips, I'd say dithers that can take an occasional beating, enough to disperse aggression. The real problem is just that though, finding fish that can take a beating as dithers. All wolves I've kept have always ignored bichirs so I think your good there, your tig, make sure he's bigger to hopefully intimidate the wolf though his can work backwards and make he wolf feel threatened and retaliate for no reason, but if he's bigger and decides to be aggressive he can do serious damage so that'll be luck of the draw imo, the dat should be fine. Masheers should be fine, DB kept his with masheers I believe. Treat it as any other wolf just like I said on a bigger size scale. Get fish that can get just as big, be just as tough, and need just as much space, and provide that space, you should be fine.