Xiao;2597550; said:Would be my guess. If so, anything large enough not to be swallowed, but not too aggressive should be fine. Openwater fish do better than other bottom dwellers, as they do get a bit territorial defending caves and whatnot. Tall bodied fish are your best bet.
What are some more oddball like tall bodied fish that can go with the cow?
What about a pig nosed puffer?(aquascapeonline.com)