Could this honestly be algae? (Now with pics..)

[eponymous]

Hi,

So my loop has been running for a couple of months now and I've noticed like a green gunk forming only on the bottom threads of the EK multi-option reservoir.

This is happening in both loops which use distilled water and a silver kill coil each. I'm also using Primochill LRT Pro which has an anti-microbial coating on it.

As I say, it's only forming on the very very bottom thread of the bottom section of the EK reservoir but I'm sure it's gotten worse since day one.

Could this be algae or is it something else? If so, how can I stop it? I would've thought the silver killcoils would've worked better...

Apart from this part of the loop, everything else looks crystal clear. Could it just be general gunk from the rads or plasticizer that's getting caught in the threads?




Thanks.