Well, a BN pleco, with LOTS of hiding areas for loaches & 1 pleco (say 5 areas) would likely be a better bet than otos. Both only eat some types of algae. I love my L-144 girl, she's ~4 inches after a few years, males get an inch or 2 bigger. The roselines may eat some kinds too. Control your light & change lots of water & you may not "need" an algae eater.
It's your tank, Ian, if you want red rainbows, sobeit…& well, we're going to need pics! I'll try not to be too snarky when they get all fore-heady, lol.