8x clown loach
2x bala shark
1x electric blue ram
2x platys
1x bristlenose plec
the clown loaches and bala sharks will eventually get too big for a 5x2x2 and as said they really need to be in groups so with their potential size they will fill your tank on their own
many people buy these species when small not realising their potential size... it doesnt happen overnight but both will get very big fish.
its quite a mix of fish that i wouldnt really put together tbh. is there any reason why you are looking at these? is it just because you like the look of them?
if you want bigger fish dont forget they can grow very fast if cared for well and will need lots of room. the cute 2 inch oscar can soon become an 8 inch brute within a few months....
if you are looking at smaller fish like the rams, platys and bristlenose then i would keep to smaller sized fish throuout the stocking with maybe the adition of a few angelfish, discus etc. something that doesnt get too big and isnt a threat to the smaller species.
the rams will need a higher temp 28-30 to thrive and can be a little sensitive. many people buy these and they are dead within a few months, maybe weeks as they dont know their needs.
this temp however isnt a bad thing as many fish will tolerate it just do a bit of research first. rams are commonly kept with discus as they share the same water parameters.
if you dont want it too hot then there is much more choice at the 26 degrees mark and most things you see in the lfs will be fine at this temp.
while your tank is cycling you have the time to research compatability of fish species not just for temperament but for water conditions etc etc. ask away with any questions and get as much info as poss before buying the fish.
a 5x2x2 is a great size tank with numerous stocking possibilities so its not going to be easy. just remember big tank dont have to have big fish.