I have set up that tank over a year ago, around second month that thing showed up.
I thought OK diatoms, normal thing. This is 65g with canister filter so water quality wasn't that good. The brown stuff didn't affected fish or corals (mixed but mostly softies) over the time I kept adding OTR skimmer (for 50g) and another bigger canister filter (eheim pro 4+ 350). Corals loved that, but it didn't help with diatoms/dino. Because I was using tap water I though OK I'm adding most likely silicates with it so few (around 6) weeks back I installed my new RODI and added banded goby for sand sifting. Since then I rarely see it on the glass but sand issue didn't budge. Unfortunately looks like I'll also loose goby today (could be unrelated) hence a little scare that it is not diatoms after all.
2 microscope pics for identification help below.
I thought OK diatoms, normal thing. This is 65g with canister filter so water quality wasn't that good. The brown stuff didn't affected fish or corals (mixed but mostly softies) over the time I kept adding OTR skimmer (for 50g) and another bigger canister filter (eheim pro 4+ 350). Corals loved that, but it didn't help with diatoms/dino. Because I was using tap water I though OK I'm adding most likely silicates with it so few (around 6) weeks back I installed my new RODI and added banded goby for sand sifting. Since then I rarely see it on the glass but sand issue didn't budge. Unfortunately looks like I'll also loose goby today (could be unrelated) hence a little scare that it is not diatoms after all.
2 microscope pics for identification help below.
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