Purchased 2nd hand marine setup two weeks ago. Now regal tang has white spot (ich).
I've had my tank for just less than 2 weeks (bought it 2nd hand) thought the fish were settling down well.
My regal tang (and other fish) has a voracious appetite, but I noticed 3/4 little white spots on each side of it's body
It lives with 7 other fish, 3 shrimps, a load of live rock with 4 largish corals in 250 litres of water.
Water quality is ok :
pH is 8.4
Nitrite is 0.1 ppm
Nitrate is 2.5 ppm
Phosphate is 0.4 ppm
salinity is 31.5
temperature is 27.8c
Ammonia and nitrate has dropped significantly, pH has risen, phosphates has dropped slightly.
Regal tang has half the number of white spots this evening.
Does it mean its going to get worse very soon? Terry Bartelme said "Hobbyists are often fooled into believing that an infection has subsided when the telltale white spots temporarily disappear. Trophonts mature and exit fish as part of the parasites natural life cycle before they form tomonts and reproduce. Generally, the white spots will reappear on the fish a few days later, usually in greater numbers."
Question is should I treat the regal tang or get a larger tank so that I can put all the fish in it for 45 days treat them with a copper based treatment and leave the main aquarium with it's corals, live rock and inverts by themselves. As this should get rid of ich on the fish and get rid of ich in the display tank.