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Message: <blockquote data-quote="D. Torres" data-source="post: 11255432" data-attributes="member: 96343">Hello. I’m trying to figure out if this is cyano or something else. I’ve used chemi clean and it works but within 2 weeks I’m back to square one. I’ve been doing about 8 gallon water changes weekly on my 20g AIO. Nothing seems to help it just keeps coming back week after week. Can someone help.Details:20g AIO established for about 3 years8 gallon weekly water changesMake my own RODI and have been for years 0 TDSFiltration:Filter flossSkimmerBio Pellet ReactorBio matrix bag Chemi PureLivestock:2 clown fish7 rock flowers 3 acan mini colonies A couple zoa fragsAbout a dozen BTA (trying to get rid of them)Parameters:Ph - 8.0SG 1.026 with ATONitrate ~ 10ppm (can never seem to lower it but everything has been thriving for a couple years)Calcium ~ 440Mag ~ 1250Phosphate not reading on salifer test but might be due to algae or whatever keeps growing in my tank. Any advice or help would be greatly appreciated. The only thing I haven’t tried is adding some live bacteria. Someone mentioned my tank might be going through a “mini cycle”. I haven’t had that issue in my 175 that’s been up and running for 5 years. [ATTACH]3097699[/ATTACH] [ATTACH]3097700[/ATTACH] [ATTACH]3097701[/ATTACH]</blockquote>