Gross looking green water

[Hyzenthlay]

My water started turning hazy about 4 to 5 weeks ago. I've been doing PwC like usual and it doesn't seem to clear up. I did a 50%wc 2 days ago and nearly killed my fish. I have no idea why. They've recovered now. Anyway now its worse than ever. I tested my water with api master kit and my parameters are: ph 7.6, temp 74, ammonia .25ppm, nitrite 0, nitrate 0. Please help!! What am I doing wrong? I have 20 gal long and I have 4 mollies, 3 tetras, 2 cory cats and 1 mini loach. Added photos of my tank, and my filtration system. I have a fluval sponge on the water intake inside the tank, then 2 sponges in the filter. You cant see it but there are fluval bead things in there too. The oval ones with a small hole in the center.

 

[JCM]

Hi i had this exact problem a while back and tried everything. Eventually i put my hand in my pocket and got a uv steriliser. It was brilliant and the water was clear in about 5/6 days. My water is now always crystal clear. This is the one i got but im sure theres loads of different options.

 

[DoubleDutch]

Yep that will solve algaebloom.

 

[ProudPapa]

I had the same problem in my 10 gallon shrimp tank. I added more live plants to use up the nutrients that otherwise would have been going to the algae, and only turned on the lights for about 6 hours per day. It took a couple weeks, but it's almost all cleared up now.

 

[RDcompton03]

Same problem. I got some floating plants, let them fill up the surface of the tank. Within about two weeks it was crystal clear. Has been ever since. Ive always loved planted tanks. Now i also live floating plants.

 

[Hyzenthlay]

ok, thanks! any idea why i need it though? it's by a window, but i can't really avoid that. my brother has a tank directly in front of his window at home, with 2xs as many fish and crystal clear water every day. i wish i knew why i'm getting this problem in the first place.

 

[Hyzenthlay]

what about water wisteria? anyone had any luck with that?

 

[ProudPapa]

what about water wisteria? anyone had any luck with that?

Yes, I've had good luck with it, and it's one of the plants I mentioned above that I added more of to my shrimp tank. Floating plants, like RDcompton03 mentioned, are also good.

 

[Hyzenthlay]

It looks even worse today. I did a 3 gal pwc. I can't see the fish unless they're swimming against the glass or up at the very top.