h202. how much is too much?

hello, I have about 7 seedlings that are between 1 and 3 weeks old. I recently started adding some peroxide to the water to increase oxygen content. Not long after I started this i noticed that the leaves on the biggest plant have turned yellow and droopy. also they have brown spots all over the leaves. could this be from overwatering or nitrogen def.? Also i started off with a very small amount of peroxide but what would happen if the peroxide content was too strong? Is it ok to regulary add it to the water or can that be harmful?
advice would be appreciated.

If it gets to the point you have to start using H2O2 then you've already messed up; lose the peroxide.

Yellow and spotted leaves are usually a sign of nitrogen deficiency.

UserFriendly said:

If it gets to the point you have to start using H2O2 then you've already messed up; lose the peroxide.

Yellow and spotted leaves are usually a sign of nitrogen deficiency.

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amen to that