Zeo and diatoms

[freezetyle]

sponge power is mainly silicates. SP would essentially be fuelling your diatoms.

how long have you been dosing Zeostart? if you have been at ulns for a while you may be over dosing and the film that you are seeing might be excess bacteria.

you could cut the SP for a few weeks while everything settles out and your diatoms disappear. or revisit the amount of ZStart your adding

[gqlmao]

I have been experimenting with sponge power and coral vitalizer, I have noticed in my tank that even with a slight over dose it will cause a layer of diatoms on my glass, even when I cleaned it the night before. Very potent stuff.