Ok, I'm about to start AlgaeFix on my tank which is overrun by turf algae (the one that is relatively short, fluffy and grabs rocks really really well). This is what it looks like under microscope. The little things, I assume, are the cells of the algae.
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If this works it will save me from having to restart the tank. I'll give it 3 weeks to make a difference, if it doesn't I'm taking all the rocks out and in the pot.