I have encountered diatoms yes, but my
nerites make quick work of that. I also have a lot of
BN plecos, so I rarely see it now. But diatoms are totally normal in a low light setup. It usually gets under control on its own as the tank matures and you get more plants to use up all the light.
I don't get much else for algae because I keep a good balance of plant growth vs
water changes vs low lighting. If I get green hair algae, that's a sign for me to dial down the lighting. I also still deal with green spot algae on the glass at times, but the more water I change out the better it is under control. Most times it's not even a problem. It happens with an unbalance of nutrients, light and lack of injected co2. So if I keep my lighting just under the amount that requires co2, i'm golden.
It takes a bit of messing with, but once you get it, you have it. I just suggest making small changes a little at a time and reverting back if it doesn't work and try tweaking somewhere else.