Yes using rodi all my life. Phosphate went up for like 7 days or so from 0.1 to 0.25 then tamed it down with gfo. Lot of algae on hidden parts of the tank with no lights.
I had a very small nem that died/disappeared a few weeks back, not sure if that can cause that algae bloom.
I have snails but not eating it, even tangs that I am curing back on feeding are not touching it.