I'm looking for just a pair of emerald crabs to help mop up some green bubble algae. I've been doing water changes, changed GFO, and vacuumed all of the algae off several times but it keeps slowly creeping back. Tested water and only level that is off is calcium which is at 500. I'm wanting to try an emerald crab or two. I had one in the past and never had an algae problem but he passed away a few months ago.
And yes I use only RODI water
And yes I use only RODI water

