The problem with spirogyra is that you can have a prolific amount of it, but the root cause was temporary and simply a trigger regardless of how balanced your tank is currently. I had an outbreak I fought for a long time that started from am ammonia spike related to adding a handful of Amazonia to a relatively established tank, and with Tom's recommendation tried AlgaeFix. It worked beautifully and has not come back since.
I did remove my inverts, however, but saw no ill effects on my fish or plants after following the directions.
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