How could I get rid of Grape Macro Algae!

[MarkoD]

if your tank is big enough, get a foxface.

[RESONANCE]

Yeah, grape caulerpa (what you have) really gives macro algae a bad reputation. I'm not sure which is worse - valona or grape caulerpa :P.

If you're intent on keeping the rock 'live', as MarkoD suggested, try a foxface. To add to that you can also try to find and buy a few lettuce nudibrachs. They're a type of sea slug that sucks the 'juice' from caulerpa and uses it for photosynthesize in their mantle. I've never used either fish or nudibrach so I can't say how effective either type is.

The sure fire way is to throw out the live rock that has the grape caulerpa growing on it. If you want to re-use the rock, let it dry out thoroughly in the sun for 3+ months before attempting to introduce it into your tank again.

You can always save your blue shrooms by chipping off as much of them from your rock and transfer them to unaffected rocks in your tank.

[ScubaSteve]

Originally Posted by Timbits

Hi did you end up getting rid of it all? I have the same problem right now and its really ****ing!

Tim, I'd recommend testing your phosphates and before you do anything else and try to pinpoint what's fueling it's growth. I suspect that over feeding or detritus in the rocks are the contributors. I have an Elos Phosphate kit if you need to double check your numbers.

Even if you think it's completely gone, it might come back if there is still a nutrient source for it.