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I had a set up a 29g tank near a window a few months ago. It quickly became filled with green water. I had intended it to be a tank for misfits and extra fish instead of culling them. I started it with a some danios, 2 plecos and a Gourami, recently I added over a dozen Endlers and Swordtails from another tank. I could barely see the fish but I could see enough to tell they were doing fine. I routinely checked the water parameters and never saw nitrites and nitrates above zero. I figure the algae was eating it all up. I also had a sponge filter from the beginning and recently added a HOB. I left for a week over Thanksgiving returning just yesterday. During that time, the tank completely cleared up. It is the clearest tank I've ever had now. Crystal clear. Also, the bad news, I tested the water as soon as I returned and as I feared the nitrites and nitrates had spiked, once all the algae died off they could not consume the nitrites and nitrates and the bacteria was not at sufficient levels to consume convert them. Surprisingly none of the fish had died and were not even acting weird. I have added more plants, done about a 50% water change and added some Prime trying to give the beneficial bacteria time to catch up. I will also reduce feeding and may even remove some fish if the nitrites don't go down. I did not find a lot of good info about green water on the internet. Anyone had a similar experience? Am I off base on my assumptions?