Whats wrong with it

IMG_2195.JPG IMG_2194.JPG My plants have had these tiny little bugs around them in my closet and they have spread to my room, not sure what to do about it but read something online about adding peroxide to the water so I've been doing that. The leaves have some yellow spots on them. I think the pests are fungus gnats but I'm not sure. Any help would be appreciated. These are being grown in DWC with a 300W LED in a 2x2 grow tent. This is only my second time ever growing.
 
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