That's what mine was, for sure. Maybe also for Ktgit?That looks like tannins from tree Parts that get in the water.
For me, I removed as many tree branches and leaves as I could from the water — a side effect of building near 2 oak trees! Then, I got some activated charcoal like they use in aquariums (but I bought it in large quantities). Put the AC in a mesh bag and added it to my filtration. It took a few days, but worked. Read up on tannins in pond water. I think that AC is the only removal method, but there may be others out there — I took the easy route.How did you deal with the tannins
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