Sponge?

[boosted306]

Is this sponge growing on my PH? I have to scrape this off every Sunday when I do my maintenance on the aquarium just to keep adequate water flow through the vents.

 

[keri]

Weird! I don't know, I can't think of what else it would be.
Can you try vinegar soaking and TOTALLY cleansing the whole PH or have you done that and it still comes back? Are your other PHs affected?

 

[boosted306]

I just run this one for now. I am adding two more here in a week or two. The PH is the only piece of equipment that is affected. As you can see it is at the very top of the tank. Lighting and flow is at its peak. Thank you for the response.