Fish can make the algae cycle fine. You just can't add so many you overfeed what the established bacteria can handle. You will have a gha outbreak & mini cycle. If that happens, cut lights a few hours a day & take the cup off the skimmer and let it overflow during the day.
Would I be better off just having the lights off all day? Or is it just better to let it grow and put in a cuc to eat it?