When we first started out 90g we started with a lot of filter feeders and corals that needed to be fed, because we could not afford the expensive lights. In my experience with this it is my opinion that what increases the bioload is the amount of food you use trying to spot feed each head.
Don't overfeed and you'll be fine. You'll know when you're overfeeding because you'll see your trates rise. And on that note, watch your trates and ammonia for the first month or so, this will be a good indication that you're feeding too much. Especially if your fish load is low.