"Probably?"Probably green water algae. If you put it in an opaque cup with a white interior and the water itself is green then that's it.
I know remedy calls for a 3 day blackout. Like wrap a blanket around the tank and don't peek blackout followed by a gradual return of light.
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"Probably?"
That tank couldnt be any greener if he tried.
Basically, you have 2 reliable options for treating green water. A 100% black out with either black garbage bags or construction paper covering everything up for at least 3 days or a uv sterilizer.
If you choose the garbage bags id run an airstone for aeration.
Light from a window is the most common cause but prolonged exposure to tank lights will do it too.
hey i am curious to know about your level of nitrates and also phosphates.
how much do you feed your fish? what type of lighting? how long do you leave it on? do you vacuum your substrate? these can all be contributing factors.
If you are asking me, I haven't checked my levels in a couple of weeks (I am at work now) but they were "fine" then.
I have a fluorescent light (10 or so hours a day), I do vacuum when I do my water changes. And I feed every morning (probably a bit too much but little to none hits the floor of the tank).
But here is the weird thing to me, I haven't changed ANYTHING that I have ever done. I didn't add plants or move the tank or alter how much/when I feed or clean.
I use treated tap water (and always have), could it be something in there that has changed?
Mark