Getting Really Interested in Fish Rearing

I have a 2-year old African catfish living in a dragon pot.  I have tilapia, marbled goby (soon hock or ketutu), patin, lampan, rainbow and fighting fish in an aquarium and several jars.  Of late, I have been catching baby ketutu.  They are such ugly but fascinating fish.  They hardly move.  I am now trying to find out more about them.