Finally remembered to reply... XD Sorry it's been so long. Anyways I fed Mort on Monday, it was late and I was having second thoughts about cutting/squishing anything, so I just caught about 6 minnows and put them in his water dish, along with 1 pinkie. He ate it! :3
Anyways, I'm going to be feeding him 2 more pinkies with about 10 minnows tonight, and slowly lowering water level and increasing pinkie numbers over the next few weeks. I'll try to remember to respond sooner, too. :P Afterwards, I'll try to find feeder guppies at one of the exotic fish stores around here. He doesn't really like worms. :\