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Hi guys,

I feel like I'm out of options right now and I've been having issues with spirogyra for a couple of weeks from now. I set up my tank in July, and everything was going super well - no algae apart from a mild early case that resolved itself. All was good until I changed my water change regime in November and started doing smaller changes (2 from 8 liters) and now I'm at 4 liters (tank is 20 liters). From the very beginning, I've been using Vimi All in Red which worked wonders.

Tested my water and here are the results:
  • Ammonia and NO2: 0
  • NO3: 20 ppm
  • Iron: before WC: 1 ppm; after WC: 0.5 ppm
  • Phosphates: 0.5-1 ppm
  • pH: 6.8 to 6.2 when CO2 is added
  • GH: 5
  • KH: 0
  • Potassium: around 20 ppm but dunno if I can trust test kits on that one
The photoperiod is 8 hours with a total of 1 hour of ramp up and down. CO2 levels - apparently around 30 ppm based on the indicator and pH calculations. Also, I started dosing NO3 since I noticed that it's been staying at 0 with just the All in Red and I thought it might be stunting the plants which might be giving algae an advantage so I've started adding it a week ago, targeting 20 ppm concentration.

At this point, I don't really know what to do and I've heard that spirogyra is one of the worst algae to get rid of so I'm starting to feel like a restart might be my only option...

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