Anyways, I have a 130 gal custom tank (5x2.5x2.5) that I am stocking. I was trying to go with fish I have yet to keep, but not having loaches in there is driving me nuts

2 common plecos (2")
2 dwarf blue gouramis
2 pearl gouramis
6 silver-tipped tetras
6 red-finned danios
4 cory sterbai
Aeration/filtration: powerhead and 2 x eheim 2026 canister filters all at surface.
So basically what I am wondering is are there botia species out there that won't pick on the cories? Also, if all of the flow is at the top of the tank, would there be enough oxygen in the lower regions of the tank for botias?
Also, I am also looking for some suggestions on fish to add to the tank. I was thinking some rainbows, but what would you add?
Thanks!
Jeremy