Hi there! I answered this in your other thread. But I will copy and paste it here too. Actually seeing pictures I can't tell if it's ick or velvet. Because of that, out of the options you will see here, I would suggest copper in a QT.
The cloudy eyes are an infection. With ich, you can't get rid of it without QT and treatment. To be rid of it in your display you will need to remove all fish and let the tank sit fallow (fishless) for 76 days. There are several ways to treat for ick, I'll link them here for you to read. The eyes are caused by the ick. Epsom salt will help with the swelling and if they can't heal the infection on their own antibiotics are needed. Kanaplex is my med of choice for this purpose, and doing it in the water in the QT is the best way to administer. This is a lot of info, but it's all good stuff. Give it a read and ask any questions it might leave you with.
How to Quarantine
Ich eradication vs. Ich management
Ich (Cryptocaryon irritans)
Velvet (Amyloodinium ocellatum)
Antibiotics: Treats bacterial infections, which are oftentimes “secondary” to preexisting parasitic infestations.
How To Treat - Follow the directions on the label of whatever product you are using. Always use a broad spectrum antibiotic medication i.e. one that treats
both gram-positive and gram-negative bacterial diseases (very important). Examples of this include
Furan-2, Kanamycin aka
Seachem Kanaplex,
Nitrofuracin Green Powder,
Triple Sulfa Powder or a combination of using both Erythromycin & Minocycline. The latter can be accomplished (albeit expensively) by using freshwater
Maracyn 1 & 2 and then doubling the dosage for saltwater use. When battling a particularly nasty bacterial infection, combining
Furan-2, Kanaplex and metronidazole (ex.
Seachem MetroPlex) can be very effective (and safe).
Props to “hedgedrew” for enlightening me of this.
Normally you have to do 4 doses to complete a full course of treatment. The instructions may say to dose every 24 hours, and perform water changes at certain intervals. In my experience, you often have to do 2 full courses of treatment (or 8 doses total) before a fish will show signs of improvement (antibiotics are notoriously slow acting with fish). If a fish shows no signs of improvement after the second full course, then it’s time to try a completely different medication. Just like with humans, sometimes a certain fish will respond better to a different antibiotic. You can run activated carbon at any time when you wish to end treatment.
Pros - One of the few medications that can safely be mixed with others. You can use antibiotics in conjunction with just about everything.
Cons/Side Effects - Appetite suppression, depletes the water of oxygen (so provide additional gas exchange).
Epsom Salt: Treats eye and other injuries. Popeye in one eye usually means injury, but popeye in both eyes usually denotes a bacterial infection requiring antibiotic treatment. Cloudy eye can be a bacterial infection or flukes.
How To Treat - 1 tablespoon per 5 gallons of aquarium water. Repeat only once, if necessary. Use only “USP” grade Epsom salt.
Pros - Reef safe, as Epsom salt is just magnesium sulfate.
Cons/Side Effects - The effects of excessive sulfate in a reef aquarium are not fully known.
