Aquarium

It's algae. Some algae is normal in fish tanks but too much is caused by an imbalance between light (intensity and duration), carbon dioxide and available food.


Do you have any live plants in the tank, or are they fake?
If they are live plants, how much and how often to you add plant fertiliser?
How long are the tank lights on for every day?
Do you over feed the fish (uneaten food will decompose to feed the algae)?
How often do you do water changes, and how much do you change?
When you do water changes, do you clean the substrate?


As a short term measure, you can scrub the affected decor. But unless you change whatever it is that is causing the algae to grow, it will come back again. We need to find the cause!

I see, from your earlier posts, that you have a Juwel Rekord 600 with 8-hour lighting from a "Tripical daylight bulb" - do you mean the Interpet Tropical Daylight Bulb? If so, this lighting looks similar to my own and I also experience BBA.

I would experiment by reducing the number of hours the lighting is on for, even by an hour, or else by having a 'siesta period' such as lights on 12-3 and 4-8, and see if that makes any difference.