What is this yellow stuff on my silicone?

[Nooooooooob1]

Tank has been running for a couple weeks now. This yellow film and dots are showing up on the silicone and return line in my sump, but it's isolated to this one chamber in the sump. Nowhere else in the system. Any idea what it is? I've never seen it before in previous systems.

 

[ndrwater]

Could be the beginnings not algae

 

[Nooooooooob1]

Could be the beginnings not algae

I thought so too, but I just find it odd that it's only happening in this one isolated section of the system. There are 105 gallons total volume but I'm only seeing it in this one area. And it happens to be the area I DIY'd a baffle in to make a chamber for the pump. I'm just worried I screwed it up somehow but I did b use 100% additive free silicone and let it cure for over 24 hours.

 

[Nooooooooob1]

Could be the beginnings not algae

Seems I'm not the first one to have it

Yellow Mold? on silicone in sump

I have some stuff that is bright yellow with brown spots growing on some of the silicone in my sump. I used Aqueon Silicone. It only seems to appear on the silicone that is under the moving water, not on places that are submerged in water. There isn't a light on the side of the sump I see it on...

www.reef2reef.com

 

[Peace River]

Seems I'm not the first one to have it

Yellow Mold? on silicone in sump

I have some stuff that is bright yellow with brown spots growing on some of the silicone in my sump. I used Aqueon Silicone. It only seems to appear on the silicone that is under the moving water, not on places that are submerged in water. There isn't a light on the side of the sump I see it on...

www.reef2reef.com

No not at all - there are multiple posts here on R2R and other info on the interwebs. I'm not sure what it is, but I haven't seen anybody say it is a probably the than the look is less than desirable.

 

[William Norman]

Peace any luck understanding this one ? My sump just started the same thing. I started my cycle 6 weeks ago with Fritz. The only change was adding a Brightwell Aquatics Xport BIO Plate 2 weeks ago that I seeded with Microbacter 7. I used GE silicone # 1. I looks like it is on your return pump hose also. Weird. Never had seen this in prior tanks.

 

[Nooooooooob1]

Peace any luck understanding this one ? My sump just started the same thing. I started my cycle 6 weeks ago with Fritz. The only change was adding a Brightwell Aquatics Xport BIO Plate 2 weeks ago that I seeded with Microbacter 7. I used GE silicone # 1. I looks like it is on your return pump hose also. Weird. Never had seen this in prior tanks.

Yeah I've never seen or heard about it either before it just happened to me! As far as I can tell from the research I've done, it's harmless to our tanks. I also used GE 100% silicone with no additives, which I've used in the past and this never happened.
The only thing I can possibly think of is that I didn't let it cure long enough. I let it sit for a solid 24 hours before adding water, whereas the last time I made a sump I let it sit for 48 hours. I don't think that would be a problem, but who knows. How long did you let yours cure for?

 

[William Norman]

Nooob1,

Crazy. I dont think it has to do with curing. Mine was cured for 7 days while I waited for the glass company to recut one of my baffles.

 

[Peace River]

Peace any luck understanding this one ? My sump just started the same thing. I started my cycle 6 weeks ago with Fritz. The only change was adding a Brightwell Aquatics Xport BIO Plate 2 weeks ago that I seeded with Microbacter 7. I used GE silicone # 1. I looks like it is on your return pump hose also. Weird. Never had seen this in prior tanks.

Based on everything that I have read it doesn't seem to be connected to a single brand of silicone, method of application, types of lighting in the area, or to added chemicals. I have not seen anything that has suggested that it is a problem other than being unsightly. If I had to guess I would lean toward something biological.

 

[William Norman]

Not much movement in my numbers. Still looks like we have about .25 ammonia.

 

[William Norman]

Starting to get some yellow on my silicon. Based on what I can find no reason for it and nothing to worry about. I tried cleaning it off. Doesn't come off. Never have seen this before in my other tanks.