i bought this tang a week ago and yesterday i seen some white dots on him so i figured it was ick so i went to the lfs when i got out of work to get some meds and when i got home half of the white spots(looks like salt on him)were gone but where they were are small black marks i do have one of those small cleaner gobies that supposed it pick ick.Do you think this is marks from gobie picking ick off of is it some thing else?ive heard of black ick from someone at fish store but have never seen it before.can anyone help?