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Discussion Starter · #1 ·
Hi,
I have placed some plants in my tank after 1 or 2 week all the leaves are getting black spot also the sand getting black so is this one are algea or some plant deficiency.
I used seachem flourish,have nutrient substrate also changed water weekly, but i think i have issue with the lighting,have 20 gallon tank and 40 watt light only 8 hours a day, no co2.please suggest
 

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