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Can anyone tell me what this growth is? I am running a 16gal tank with a Penn-plex Cascade 500 canister filter. After the first week with fish I had Long clear growth on the plastic plants. I took everything out and cleaned it in 1 part bleach and 4 part water. I thoroughly cleaned the filter canister and put everything back together. After 2 days this is coming back. I have had this tank for the last 4 years and I have never seen anything like this. I was using a hang on filter with now problem. I go to a canister filter and am so far having nothing but problems. I water parameters are all good except my nitrates are a little high. I just did a 25% water change to combat that. Any help would be appreciated. I am at a loss. Thanks, Rob...