Sharing my experience so far of using hydrogen peroxide to fight white spots on my fishes.
Recently introduced 2 new fishes (Powder Brown Tang + Blue Tang) into my main tank. I guessed the introduction stressed up all the fishes as they needed to establish a new pecking order. 1 week later, the PBT developed tiny white spots on its body. Thinking it was the due to stress faced by most fishes in a new environment, I decided to monitor for the time being.
A few days later, my existing brown tang, singapore angel and a maroon clown also started developing white spots. At this point, these 3 folks were still eating well. Fast forward another 2 days, these 3 folks started to hide in the rocks and were not eating. I was getting worried. Soon after, the PB Tang which was the first to had white spots dropped dead.
While searching on the internet, I came across several postings on various reef keeping forum about using hydrogen peroxide to fight white spots. Following their dosage recommendations, I added 1 ml/gallon of H2O2 to the tank. I used the 3% concentration H2O2 bought from Watsons. The regime requires me to dose once every 8 hours for at 2 weeks. This dosage is supposedly safe to corals, clams and other inverts.
Day 1: Added first dose at 1 pm.
All existing fishes were hiding in the rocks and not eating. My brown tang looked bad. Whole body covered in white spots. Even the fins had white blotches. Singapore Angel was lying on its side inside a cave. Basically, all of them looked like they're going to die soon.
1.5 hours after adding first dose, the fishes started coming out and were swimming actively. The angel and tang were eating from the nori clipped to the wall.
Second does at 9 pm.
All fishes still swimming and eating. Looks pretty active. Around 11 pm, just before I switch off the lights, I notice the spots on the brown tang had mostly cleared up.
Third does at 7 am.
Couldnt wake up on time at 5 am! Hahaha. Added in the 3rd does. Checked on the fishes. The white spots on the brown tang are completely gone. Spots on the maroon clown and Singapore angel have also lessen considerably. Threw in some pellets and they started fighting for it. Looks good.
Existing soft corals all okay. Snails and clams also doing fine.
Will continue the regime for 2 weeks and update accordingly
Note: This H2O2 dosing method is pretty controversial as there are conflicting write-ups about it. So if anyone wanna attempt it, do so at your own risk