Slime algae (cyanobacteria) can be a real headache! A persistant approach is needed in order to rid the aquarium of this pest. Cyanobacteria comes to feed on excess nutrients in the aquarium, mostly phosphate and nitrate. It needs nutrients in order to survive and grow. I would first consider asking your LFS
to test your water for phosphate and nitrate. If phosphate or nitrate is a problem, using RODI
or distilled water for water changes and topoff water will help. A properly functioning protein skimmer will remove DOC
's from the water column and prevent algal and cyano
blooms. If phosphate is considerably high, you may want to consider using a phosphate absorbing product such as RowaPhos.
seems to grow best in areas of low water flow. Consider increasing the amount of flow in the tank to prevent "dead spots."
If all else fails, consider the age of your aquarium bulbs. Old bulbs can emit a different spectrum of light than they were intended to do so which could encourage the growth of cyano
. Hope this helps.