algae (?) slowly grows in little spots inside

[janeskid]

We've something, algae(?), dark green to nearly black, slowly grows in little spots on the inside of fresh water aquariums. Easily removed by scraping it off with a razor blade.

Is there some way to prevent this minor nuisance?

[escamosa]

How much light is getting to the tank? Is the tank near a window, or do you leave the tank light on for long periods of time? And how often do you do partial water changes, and how much water do you change?

[Cliff]

If all you are getting is just a little bit of algae that can be cleaned off real easy, I would not worry all that much. Just make sure it is not cyanobacteria tho. The below link can help with that.

http://www.aquaticcommunity.com/aqua...ad.php?t=83695

Edit, forgot to mention, +1 to the above post

[janeskid]

Thanks. The situation arose when the sun fell low enough in the midday sky to hit the end of two aquariums. So obviously a light problem I am embarrassed I asked.

[Strider199]

Hey we all over look stuff, (except maybe 850R ).

At least you came up with the possible cause. Now you can take action.