• Welcome back Guest!

    MARSH is a private reefing group. Comments and suggestions are encouraged, but please keep them positive and constructive. Negative threads, posts, or attacks will be removed from view and reviewed by the staff. Continually disruptive, argumentative, or flagrant rule breakers may be suspended or banned.

White residue on surface.

R33FM4N

Guest
Joined
Jul 2, 2015
Messages
9
Reaction score
2
Location
Houston, TX
There is a white film on surface of the sump. It has a slimy consistancy. I tested water parameters (ammonia, nitrates, nitrites, calcium, PH, hardness, phosphates) and the only thing that seems to be off is that the phosphates may be a little high.

Any thoughts on what it could be?


Sent from my SAMSUNG-SM-G935A using Tapatalk
 

DwPolcyn

Supporting Member
Joined
May 16, 2019
Messages
247
Reaction score
215
Location
Spring/Klein
I had something similar on my 24gal where there wasn't much water turnover on the surface. I would guess it's some form of algae.
 
OP
R

R33FM4N

Guest
Joined
Jul 2, 2015
Messages
9
Reaction score
2
Location
Houston, TX
First off, thanks for the responses.

To answer your questions/comments, I do not dose the tank with anything, and I am positive it is not salt creep or hard water deposits. it is not hard or granular. It may be an algae, but I have never heard of or seen a white algae, other than white hair algae in freshwater tanks. Maybe a bacteria???

I have not replaced my membrane filter in my RO system for over a year. I thought it may be related to that. I replaced it last week, so I guess I will know shortly if that was the culprit. I also bought a TDS tester to see what that turns up.

It is funny that even after 4 years in the hobby, I still run into things I have never seen before. I guess that comes with the biological diversity that SW tank bring to the table. LOL
 
Top