A skimmer isn't a save all to end all method of preventing things. Its only meant to be another mechanical way of exporting extra nutrients. Not something to rely on totally for keeping your tank nuisance free.
As stated above there are several things you can do:
*Reduce lighting cycle.
*Several water changes over a couple weeks. (how much and how often is really up to you, just dont go nuts with 50% every day or something)
*Make sure your temperature isn't swinging say, more than 3-4Â° from midnight to mid-day.
*Make sure the new water you're putting into your tank is extra purified (the water I put into my tank is RO
, micron filtration, and two times through UV
and Carbon - essentially seven cycle filtration).
What are the inhabitants to your tank? How much LR
do you have? What other means of filtration are you using? What are you water parameters?