White spots

The filter and other things are behind the black plastic. So i will need to add things to increase the water movement?
 
What exactly, is behind the plastic? You need to tell us every thing about your filter .All I know your tank is 3 weeks old. How large? Is that a true live rock or a dead rock? what is that substrate? What is your nitite/nitrate/ammonia. Did you cycle that tank or just add water and fish?
 
What exactly, is behind the plastic? You need to tell us every thing about your filter .All I know your tank is 3 weeks old. How large? Is that a true live rock or a dead rock? what is that substrate? What is your nitite/nitrate/ammonia. Did you cycle that tank or just add water and fish?
There is a temperature control, 2 air stones, filter and a protein skimmer. I cycled the tank and water before adding the fish, I used an empty tank, adjusted the temp and everything else for a week than added it into the tank to let it run for 2 weeks before adding the fish. The tank is 24L. That is a true live rock and the rest are just stones. The nitrate i checked is 0.1ppm.
 
Based upon the first pic you posted, I think it is likely that your fish has Brooklynella (more info below). I also think there is a good chance this tank is not even cycled - please test for ammonia ASAP.

Brooklynella:

Symptoms – This is most often seen in clownfish, but it can afflict any fish. The fish’s skin will appear to be peeling or sloughing off, oftentimes causing excessive white mucous to form around the affected area(s).

Treatment options - Formalin bath, followed by additional formalin baths (as needed - but give the fish a day to recuperate in-between baths). You can use formalin in a QT (at a much lower concentration than the bath), but great care must be taken to provide plenty of gas exchange as formalin will quickly deplete the water of oxygen. For this reason, doing baths is the safer option as the fish can be pulled from the formalin if showing signs of distress. Formalin-MS is preferred, as that contains 37% formaldehyde. However, in a bind, any medication containing formalin (ex. Quick Cure) is better than nothing. Alternative treatments for brook include metronidazole (ex. Seachem MetroPlex) and acriflavine (ex. Acriflavine-MS). A freshwater dip may provide temporary relief if you are unable to locate any of the aforementioned medications right away.
 
I'm guessing you're not in the USA (because you refer to your tank in liters.) Therefore, you may not be able to obtain formalin. So your best bet for treating this fish is going to be a medication which contains either acriflavine or metronidazole. Performing a FW dip may buy you some time until you can locate the aforementioned meds:

Freshwater Dip: Provides temporary relief for Brooklynella, Flukes, Marine Velvet disease (Amyloodinium); possibly even Ich & Uronema marinum (both unproven). Can be used to confirm the presence of Flukes.

How To Treat - Fill a bucket with RODI water, and use a heater to match the temperature to the water the fish is coming from. Aerate the water heavily for at least 30 minutes prior to doing the dip, then discontinue aeration while performing the dip. Fish aren’t overly pH sensitive for short durations like this, but you can squirt a little tank water into the dip just before the fish goes in to help bring it up.

Place the fish in the freshwater (FW) dip and observe closely. It is not unusual for them to freak out a little at first. Also, tangs are notorious for “playing dead” during a FW dip. The important thing is to watch their gills; they should be breathing heavily at all times during the dip. If breathing slows, it’s time to exit the dip. Dip the fish for no longer than 5 minutes. Multiple dips may be done, but it’s important to give your fish a day to recuperate in-between dips.

For flukes, use a dark (preferably black) bucket so you can see if tiny white worms fall out of the fish (especially out of the gills) at around the 3-4 minute mark. The worms will settle to the bottom, so you can use a flashlight to look for them there as well.

Pros - Provides temporary relief for a wide range of diseases in a chemical free environment. Can “buy you more time” until a proper treatment can be done.

Cons/Side Effects - Not a permanent “fix” for any disease, as FW dips are not potent enough to eradicate all of the parasites/worms afflicting the fish. Some fish can have an adverse reaction to a FW dip by appearing unable to maintain their equilibrium once returned to the aquarium. If this happens, hold the fish upright (using latex, nitrile or rubber gloves), and gently glide him through the water (to get saltwater flowing through the gills again). It is also a good idea to place the fish in an acclimation box until he appears “normal”.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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  • No.

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  • Other (please explain).

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