How do I fix this?

[NickD]

10 gallon with plants and substrate, it’s been like this for months and I do 80% water changes sometimes, and it still comes back to this!! 

[lefty o]

is it exposed to a lot of natural daylight coming through a window? green water is often triggered by that hot intense daylight coming in through a window.

[NickD]

how did u know lol?? It’s right next to a big window actually. I should move it and see if that helps, thanks 😆

[Tlindsey]

@NickD what's the temperature of the aquarium during the day?

If the temperature is ok for the fish you have I suggest placing a dark background on the aquarium to block  

the daylight. 

[nabokovfan87]

Move it yeah, but adding vinyl blackout film to the wall helps as well.

[lefty o]

On 2/4/2024 at 12:21 PM, NickD said:

how did u know lol?? It’s right next to a big window actually. I should move it and see if that helps, thanks 😆

just a wild guess!🙈

[Dacotua]

Not sure if I can post links to stuff or not, but buy and put one of these in your tank

https://www.aa-aquarium.com/gkm

*IF* you have a canister filter, you can buy for the canister filter as follows: (But I assume you're only running a sponge filter)

https://fluvalaquatics.com/us/shop/product/uvc-in-line-clarifier-series

(I use Fluval canister filters, so the inline clarifier works well with me. I have it run for 6 hours each day..)

[Galabar]

Can you share your water parameters with us?