sunlight or bug problem plz help!

ok well this is my first grow and after being out of the counttry for 2 weeks i find out only one of my plants survived becuz my sister is stupid and didnt water them enough...

well now on my last plant i am getting withered leafs and the bottom leafs totally fell off what is the problem gnat larvea (which i already had a problem with and i think i fixed it) or too much sunlight

i would also like to know the strain if possible form pictures
 

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