but in december, due to a hectic work schedule i was only around to feed in the dark and do weekly water changes, i didnt even notice how skinny he had become...
i was thinking it was a recent food switch, or my over zealous jack dempsy eating everything...
now internal parasites are becoming a possibility. i saw him eat a pile of bloodworms today, so i know he is eating.
i had been over feeding my tank this last week just to see if i could get him to eat something
and i think the less than ideal water conditions (and his weakened condition) caused this yellowish-whiteish spot to appear.
im not sure what it is, fungus? its not fuzzy. parasite? its not raised, and there is only one...

any ideas as to what i should do? this is my first scaleless fish
thanks
im lost. i dont know what to do.