Definitely. This algae looks good too![]()
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None since you can't exactly harvest it. I'm sure you could make a little by selling rock that it covers and then replacing the rock. I highly doubt you'd profit though.
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just for giggles, see if you can wipe it off. I am thinking that you may be having some cyano. not bad, just a sign of your tank cycling. coraline doesn't come from nowhere, you have to add some to your tank to get it to grow.
Coraline algae is hard and has defined edges like you can see on my back glass.
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If in fact you have cyano and an unstocked tank, just kill the lights for a few days. suck the stuff out with the gravel vac.