I'd try giant danios or silver dollars but be prepared for it to end up just like the tinfoils. I have several 4-6" cichlids in a 90 and my Jd has just decided that he wants the whole tank and is taking out 2" tiger barbs like they are candy. They ll be moving into a 300 in a few months, but the only thing working for now is isolation of the jack to a 20 gallon and total rescape of my main tank. Seems to work ok for a week or so, but I've had to repeat this process 3 times now. I can't get the new tank built fast enough