Diatoms bloom month 4

[benboarder90]

Hello everyone, hope your tanks are doing well

So I’m still having a diatom bloom at month 4. I’m sure I know the answer/ root cause. Just want to make sure I’m not over looking something or missing the obvious. I feel I have a bad membrane or 2 and it’s letting silica through.

My tank is a 75 gallon
Start date April 17th 2026
Brand new BRS 75 GPD RODI
I have a full back up set of filters.

I feel I have a good clean up crew
Urchin
20 + hermits blue and red leg
15ish assta snails
5-10 margarita snails
6 nasaria snails
1 tiger conch
3 emerald crabs

60 lbs live rock (35 lbs was dry rock)
60 lbs live sand

2 clowns
2 cromis
1 blue damsel
1 valentine puffer small to medium
1 6 line wrass

Ammonia 0
Nitrite 0
Nitrate 4
Phosphate 0.10
Cal 440
Alk 8
Mag 1300
Ph 7.9

I do a 10 gallon water change bye weekly
I have a bubble magus curve 5 protine skimmer
10 gallon sump

Thank you for any input or if it is the silica

 

[Tahoe61]

Have you added any new equipment?
If possible an image might help. Are you sure it's diatoms?

 

[benboarder90]