plant laying down. need a diagnosis

My plant is looking a little sad (the one in the top right) not sure what is the problem tho. I have been warering my plants with h202 water for the last 2 days to kill gnats and this happened. I also sprayed some flies the other day with soap water but the rest of my plants doesnt seem to be affected. It could be a nutrients problem but im just following the dorectoons on my flora perfornance pack. Help would be appreciated
 
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