I have this same stuff
@JMacedo It's been a long battle for me also. It's never really effected my display tank either with no effect on the corals. Mine is more whitish in color but looks pink out of the water.
Increasing the flow through the sump has helped quite a bit for me also. Cutting back on dosing Aminos has helped too.
Still get some stubborn growth in 2 of the 4 chambers in my sump. Grows like a skin on top of the water and the long stringy stuff loves to grow on the probes . Likes to grow on the walls of the overflow also so I drain and clean that during water changes. I remove it daily from the sump with a turkey baster and it is under control but I cannot get it to stop.
Very frustrating. I sent a sample to
@twilliard who identified it as bacteria which I expected. Hydrogen Peroxide and Chemiclean have no effect on it. Wish I could figure out the cause.