i have had tangs that eat nuisance algae...
feathery type hair algae, grape caulerpra...
my experience is with yellow, red sea purple, red sea sailfin and the powder blue. all of which ate nuisance algae for me.
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any big difference in activitiy or parasite resistance between Red Sea and Pacific Sailfins?
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in short, no. the difference between the 2 are subtle body pattern and coloration differences, which IMO put the red sea on top. also, red sea fish are claimed to be some of the hardiest fish around.
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Would you guys say that A. japonicus is a bit more resistant to ich compared to a powder blue?
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no, but i havent had experience with japonicus (yet). but FWIW my powder blue never got ich.
my yellow tang had black ich develop after coming home from the LFS. all i did was drop in a pair of cleaner shrimps and it was eradicated in a couple of days.
my red sea sailfin and purple, were both introduced at the same time as small juveniles, they both developed ich due to the stress imposed by the resident (larger) yellow. once the yellow got used to the new tangs, the ich subsided, and that was probably within a week.
HTH