Personally I think you added too many fish at one time and added too many of the wrong kinds. I think you will have territorial problems in that tank and that will lead to stressed out fish in which will lead to unhealthy fish.......aka.....Stop eating. The RTC's will not tolerate each other and may not get along with the hybrid. The TSN...... He wont bother anyone except when he flips out and gets everyone else startled. What size is the tank they are in now ???
I'll say it again because I dont think anyone ever listens...........
Unless you have a HUGE tank RTC's are best kept alone. meaning ALONE as in only themselves. I say this for many reasons but the #1 reason is they dont really do well with others. I have kept many RTC's and the ones I have kept alone ALWAYS do much better, and have MUCH better personalitys to boot !!!!
Not many people can devote a large tank to a single 2" RTC then a huge pond to a single fish but thats how they do the best in captivity. I devoted a 150 to a single 2" RTC and he has become almost like a pet dog already. He eats out of my hand every day and everytime I'm in the room he's at the surface begging for food. Thats what RTC's are all about but most people never see that side of them because they are kept with too many other fish. I also have a few TSN x RTC's and my favorite one is also kept alone. He too acts differently from the rest and is a pleasure to own. I just lost a large TSN and gave two little guys away, them I will not be replacing.
This is all just my opinion of course, as I'm sure there are many happy cat owners with crowded tanks, but get those fish separated and you will see what owning a RTC is all about and why some people devote so much time and money to keeping them.
Again...... JMO
bob