Is it ok to dip spa in 6% hydro peroxide

[Guss]

Hello guys. I have some sis and they won’t open I noticed some green algae on the pulp when it’s closed not a lot thu. I hear hydrogen peroxide is good but I can only find the 6% .is it safe to use or I should find 3%

 

[Reefing_addiction]

I would dilute with tank water. 1:1

 

[Reefing_addiction]

Another thing don’t leave in dip for for than 2-3 minutes. If you want to go longer than make a 1:2 ratio of h2o2: tank water
Not exceeding 5 minutes in the 1:2 dip