I use mostly carni sticks, which he shows no interest in at all now. I supplement with the other foods. I have five filamentous barbs in there with him now. He will school with them on occasion.
In reference to the tiger, not the tankmates. Charney's fish sounds picky and not well suited for the method you mentioned.
IF he goes too much longer that is the route I will have to goDrop in 1 feeder at a time and get him used to hitting what you drop in. Than switch to thin tilapia fillet, than cubes of tilapia, than stuff it with pellets, than just do pellets.
I used to do it with my armatus and I did it with my gatf now. Be patient. Yes this will take 3 months time, but at least it will be healthy and grow. Rather than starve for 2 weeks, feed, than starve again and see little if any growth.