The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
Could be that too if the brown creeps along and spreads, then likely probable. You can try some Phosguard or here is a nice chart I found it has a couple more options - phos... to remove silicates. https://www.seachem.com/filtration-removal-chart.php
I am about 90% sure it’s diatoms it’s nearly doubled in amount and I found brown sludgy algae on my glass.
*the first image is from last week and the second two are from this morning *