I went through a couple of waves of algae bloom while my tank was cycling, the worst coming at about the same age as your tank is now. The source of organics is probably some die-off from the LR, even if it was already relatively cured.
The main thing I did to curb the algae growth was cut right back on the amount of time the lights were on. I went down to 5-6 hours per day for awhile. The snails and crabs will help. I did this just before I went away for a week and I was surprised how clean the tank was. If your skimmer is working properly I would just keep doing what you're doing- everything will come into equilibrium soon enough.
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