How big is your tank?
How big are your clown loaches? Your oscars might only be 10cm now, but in 6 months time they'll be ~25cm where as you loaches might have grown 1-2".
I sure hope you're not planning on adding the convicts to that mix unless your tank is 1000L+. I wouldnt recomend convicts as feeders, get something a big 'dumber' like platties, convicts have pretty strong survival instincts. I had a 1" feeder con survive in a tank with a black aro, jag, green terror, jack dempsey, and a big fire eel and turned into a bossy 5" male with awesome finnage and a big lump on his head!