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Possible Algae Issue?
A few of my plants have this brown/black residue. Could someone give me any advice on what could be causing this possible algae issue?
Tank Size: 260 litres (68 Gallons)
Lighting: Fluval Aquasky LED 2.0 33 WATTS 145cm long
Light Cycle: 9 hours
Fertilisers: Flourish Iron...