Unresolved What's this nastiness growing all over my ulva and other macros

no none there. just in the fuge.

 

Then I wouldn't mess with it. If you don't have it in your DT than your fuge is working. A fuge is suppose to look like a swamp. You can try to resolve it and starve it out but you don't want to mess with it so it doesn't break free and make it to your DT.
Have you tried cheato in your fuge?
This is from my personal experience.

 

+1
Just what I was thinking.

 

I had cheato in there before and it died because I left the lighting on 24/7. but still saved a little ball of it. hoping it will grow out after some time. So I'm guessing that it won't harm the plants in there if I leave it?

 

I'm sorry, I can't say if it will or not. I do not have any experience with plants. When I had cyano in my fuge it never affected my cheato.
What are your parameters? What is the flow like in your sump?
Are your plants still growing?
My sump is a complete swamp. I cannot see in the side walls. It has all types of algae. I alternate light cycles. My fuge light is on when the DT lights are off.

 

My water parameters are normal. I got to the source of my nitrate issue I had before so now it's stable at 10ppm but another water change should bring that down all the way...the flow through the fuge is a nice lazy river flow and the plants are growing as far as I can see. not extremely fast but growing. I guess I'll just let nature run it's course with the sump.

 

IME that is the best. Get your params in check and starve it out. As long as they are still growing I wouldn't be to worried at this point. Good luck.

 

thanks for the help!