i bought him about 4 months ago he was no more then an inch and a half. Now the bugger is about 6-7 inches and will eat anything when it's hungry. I have him with a pink tailed chalceus and when ever the wolf is really hungry he bites the pink tailed Chalceus. You can't keep this fish with anything smaller then it, and you shouldn't keep it with anything a couple centametres bigger.