Firstly, the fishes come from different areas. Especially many L numbers like hot temperatures, loaches rather avoid.
But more importanly, an Ancistrus (from Paraguay, that is ideal is 23 C) will eat a whole algae cover, with all the little animals in it, and might even scrape a bit of the wood underneath. You hillsteam loach might not eat the algae, but it will most certainly eat the little animals among them.
Which, in a tank with Ancistrus, will have been eaten by this Ancistrus.
Competition might be good, but you better avoid unfair competition in your tank
Loaches quite often don´t eat the algae, but the small creatures. These can be bacteria, small legged animals - lots iof variety
I keep both my BN pleco & hillstream loaches in unheated tanks here in warm-ish California... but not together.
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