MBU puffer is sick

[denmark-mbu]

Our puffer mbu will not eat and he is only laying in the corner of the tank. The tank is 800 gallon and he goes with frontosas. He has not been eating the last 4 days. We have noticed some white spots growing on his body about 1-1,5 mm and one which is a little bigger about 5 mm on his back. He has had these spots for a while but has been eating and swimming untill the last 4 days. Do you have any suggestions what can be wrong with him?

 

[kno4te]

How’s the water parameters? What’s the filtration? Any carbon? What have you been feeding?

 

[denmark-mbu]

Chlorine..... 0
PH....... 7
KH...... 6
GH..... 7.5
NO2.... 0
NO3.....25

Sump filter 135 gallon with 3 compartments with filter mats, 2 compartments with bio-balls, 1 compartment with biohoms, 1 compartment with sand and plants, last compartment pump and UV and before inlet to the tank ammonia and Nitrate filter
MBU main feed is thawed frozen clams with shell

 

[kno4te]

See what Fat Homer thinks. Can’t make out what’s on the skin. Maybe it’s roughed up. I’m just thinking out loud. Maybe a 1/2 dose of levamisole or epsom salts.