Recently got a pair of diamond gobies. Suppose to be a bonded pair. Since doing the ttm Qt. They have been doing a lot of fighting. Using 2 20gal longs with bowl of sand. Finally had to pull the smaller one out stopping midway through it's QT for fear of it getting killed. What are my chances of later adding them together in my 240gal? Is it big enough if they aren't bonded or one still kill the other?