I am having difficulty beating a white spot problem on my mega clown plecos. I recently lost my zebra and queen arabesque plecos to this same illness and have been treating the mega clowns for three days now with Quick Cure-a formalin malachite green medication- 1 drop per gallon daily. The spots have only gotten worse. The male is fanning eggs and I have included a picture of him taken 30 minutes ago. I have no clue why they dont seem to be getting any better and was curious if anyone has any ideas as to what I might be doing wrong or what disease this might be. I thought at first this was ich but the QuickCure doesent seem to be making a difference. I read an earlier post entitled "need help, ich treatment is NOT working" where someone suggested that this might be chilodonella for that fish in that situation. Does anyone know if this might be what I am dealing with here? I have included all of the pertinent info below.

1. Water parameters
a) Temerature range-86
b) pH.6.7
c) GH 0-1
d) KH 3
e)Ammonia 0
Nitrite 0
f) Water change frequency- daily 25% 50%ro/50%tap
2. Tank set up
a) Size.20ghigh
b) Substrate.bare bottom
c) Filtration.ATI#5 w/ rio powerhead and another sm sponge bubbler
d) Furnishings-various slate caves and a terracotta cave
e) Other tank mates-mega clown pair only
f) How long has it been set-up? just over 2 months
g) When was the last new fish added? just over 2 months ago
h) Foods used and frequency? frozen blood worms, 1-2 pea size portions at night and the occasional shrimp pellets