I would like to know, from your experience, how much of a 3% hydrogen peroxide solution (available at my local grocery) I need to mix, with, say, 5 gallons of water, to rid plants of snails, algae (principally, bba). Time of immersion is also needed. I have tried a 5% solution of bleach in the past, and although it works well, it can be tough on the plants. The plants in question are large annubias. Thx in advance. 
Walter
Walter