Early stage algae on crypts: what is it?

Jack B

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3 Jan 2020
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Location
London
Hi everyone,

Haven't had any significant algae in my first tank so far - but now after 9 weeks I'm getting some raised spots of algae on the crypts. It's on around the perimeter of some leaves too - see pic.

Does anyone recognise it and/or have thoughts on first course of action?

90cm x 45 x 45

Low tech

TNC complete according to instructions on pack

Circulation: will test actual flow rate asap, but I think it's fairly good - certainly at the top end of what the outlet can cope with. Tank is drilled: inlet and outlet at top of waterline, one at each end of the tank.

Light is 'Fluval Plant 3.0 45w LED' on for 8hrs per day at 33%

Livestock: about ten amanos, ten RCS and since yesterday 8 habrosus corys

Thanks!
Jack
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