Black algae stuff in 29 biocube help

[joshreef29]

I have no idea what this is!! I keep scooping it out and it returns almost immediately. This black stuff is consuming my tank and also this grass is growing like crazy and I don't know how to get that to stop either. Help?

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[snakeblitz33]

The black stuff is a form of cyanobacteria. The grass like stuff is green hair algae.

Your tank has nutrient issues. Use only rodi water for top offs and water changes. Do weekly 30% water changes. Keep your temperature and salinity stable. At every water change, stir it up with a turkey baster and siphon it all out as much as possible. Pick off as much of the green hair algae as possible and turn the rock over. Its an uphill battle, but its worth it.