...in an established tank, where no new fish have been added for over 2 months, regular water changes have been carried out, and nothing (as far as I can tell) has changed???
I am currently battling [by far] the worst case of white spot I have ever experienced. It has claimed one big uaru, 3 out of 4 clown loaches (~4-5") and a small geo surinamensis. On the bright side, the P. palmas seems completely unphased and unaffected and is as fat and happy as ever. Since noticing it the temp has been turned up to 28C, salt added (not at full strength), 25-35% water changes every 24-36 hours, and regular dosing with that horrible blue White Spot Cure.
The tank is a 3'x18"x18", its only been running for about 3 months but was set up using the two established canister filters from my 4' tank, and 2/3 'old' water from the 4'er, so it should have been well cycled. Despite all this, the fish seem to be struggling to shake it, and I'm getting more and more depressed.
Other than new fish introducing it, what else can cause such a sudden outbreak of white spot?
And does anyone have an accurate measure of how much of that blue White Spot Cure to use, rather than "2 drops per litre"? I measured 100 drops to be about 7.5ml, which would treat 50L of water. Even the big 1L industrial-sized package still only says "2 drops per litre".
Rant over.