u/Aromatic-Fan3498

Need a little advice please, my seedlings are just over a week old (indoor grow tent) and i have just noticed gnats in my coco coir / living soil pots. Will hydrogen peroxide (1.6 L water & 0.4? hydrogen peroxide) damage the seedlings if i flush the pots now? I'm worried that too much water will drown the seedlings in their pots? Thanks in advance................