The silt reminds me of the gelatinous mass I used to get in my monster skimmer cup ... just softer and more spread out
Here is the algae tank as it slowly built up it's algae mass
unfortunately, the silt and algae was not what I had in mind for this tank... so I scrubbed down and started again
this time, I had to focus on work and family and let it go... that negligence is what ended up forming the algae / sediment tank.