You can probably get away with that stock for 5 years, but I think you'll be pushing it towards the end. You'll most likely have to increase your water change schedule as time goes on.
Ok sounds good I mean it might not even be 5 years it may be only 3 or 4 but will see and yeah I'm excited to get some loache's I will have to wait until June but still!
I didn't see what size the loaches are now. If you get the most common 2" ones, you will easily get 5-8 years before it matters. If you do get at that size, get many more than you want Kong term. The mortality rate is usually high with small ones.
So I have good news it still will not happen until june but I found a 210 gallon! I want to do this stock for it. There will be 1 Oscar, 5 clown loaches, 8 silver dollars, 1 featherfin catfish, 1 firemouth cichlid!.
Individual behavior can be different, but when I had an Oscar, my clowns hid all the time. Also the growth rate is much faster with the Oscar. That could be an issue if you get small clown loaches.