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Thanks for the advice about the ammonia filter. We got rid of that early on. Also, we now have a small white blob growing in the gravel. A UV sterilizer looks like a pricey investment. Since we don't have fish in the tank, we could just start over, using some water from a stable tank...

Thanks. We did black out the tank a few days ago. The water now is still green, but less cloudy now. Any thoughts about how to salvage what we have or start over? There are no fish in the tank. Should we keep a percentage of the water in the tank and add more or start over?

Kame, thanks for your reply. The tank receives no direct sunlight and contains no plants. We reduced the tank light time already. Thanks for your insight about the filter, especially the detailed numbers supporting your recommendation; we will definitely look at replacing it. About your...

Hi! We started a new 20 gallon tank 9 weeks ago using some water from a previous betta tank. After 2 weeks, the tank was cycled (0 ammonia, 0 nitrites, 5-10 nitrates). Next, we added 3 guppies, 2 gold panda mollies, and 5 cherry barbs. About 10 days later, the water turned cloudy and green...