In April, got a new 20gal L. Filled with untreated good well water some flat marbles. Was given a well seeded sponge filter, use with 200 Fusion pump. Waited 3 wks. Tool water to LFS. Owner did PH & Amon. Said good to go. Got 6 fancy guppies & Hornwort. I have hood with 17 watt Fl. (not good for plant, it died what a mess!). Water at 78. After 4 weeks took out plant. Cleaned, took off 5 gal. rinsed sponge in old water. Added new water with same API salt and Stres Coat I started it with. 5th week got 2 Corry's but water already getting cloudy. PH constant 8-8.2 Am. not quite .25. Week 6 took off 3 gal. No sponge rinse. Only feed 2 x's a day what they eat in 2-3 mins. Real cloudy! Did not feed for 2 days. Will get nitrates tests tomorrow. (was sick today). Fish very active! Told I had bacteria bloom. Some say leave it alone, some say change daily, some say once a week. SO confused! Should I get another seeded sponge filter? Oh added all plastic aquatic plants, well rinsed. Thanks to any that respond! new2guppy