How to identify diatoms vs "other"

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PedroYoung

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Do you know your silica?
mother things to look is po4 and no3 is any of them at zero or near?
Yeah, silica is usually around 125 ug/l on Tritons. Randy on the chem forum says that's cool. PO4 is usually around 0.03. I'm trying to lock down what's actually in there (algae vs diatoms) before I go chasing rabbits.
 

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Yeah, silica is usually around 125 ug/l on Tritons. Randy on the chem forum says that's cool. PO4 is usually around 0.03. I'm trying to lock down what's actually in there (algae vs diatoms) before I go chasing rabbits.
Have you got any pictures
 
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Have you got any pictures
Here are some phone pics with filter. I actually ran a test from the “are you sick of dinos yet” thread which instructed to put a sample of the material with 100 ml of tank water and 5 ml of H2O2. There were bubbles generated which is supposed to indicate not Dinos or diatoms, but instead cyano. I’ve never had brown cyano, but maybe.

A1EF6DF2-D18D-41FB-A7BD-DB5C73B48C36.jpeg
15CFE53D-7838-465E-8D10-F62B447E8DB8.jpeg

754E6D4D-3920-4DA8-A94D-642780A2748A.jpeg
 
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It does have the look of Lyngbya. Does it grow in the shade?
It does not seem to grow in shade. I looked up Lyngbya. It seems to be stringy? My pest is really more like a powder, will toothbrush right off and doesn't really get vertical from the surface.
 
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