I've had a purple firefish & rainford's goby in QT for 3 weeks. Both have been doing well & eating well. About 2 days ago i noticed P. firefish was hiding a lot & wasn't moving around too much which is unusual , but still eating. Today I noticed a small white spot - just one - on the upper left back of dorsal fin ( or your right side upper back looking at photo). I tried taking a photo the best I could but he was continually hiding in one of the pvc pipes. Here is photo & if you look closely u can see white spot where mentioned ( just under the dark dorsal fin at the back). So could it be beginning of ich or a fungus infection?
