[Saikat]

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

 

[808style]

It looks like diatoms which is pretty normal for a newly set up tank. Should go away after a while. For more info https://www.aquasabi.com/aquascaping-wiki_algae_brown-algae

 

[victorusaconte]

Touch the plant and brush it with your finger. If it cleans the plant its not deficiency.

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[Saikat]

Also you see the anubias leaves getting white spots didnt knew what is this one.