A coworker asked me if I could babysit his betta for the summer. HIs fish was well (although he was kept in an unfliltered 1.89 gallon bowl--with a heater), but after he got to my place, I put him in a 10 gallon cycled aquarium and he developed an ich spot. Just one. I thought I'd wait it out because I figured the commute stressed him out. Well the ich spot is gone now, but I am left wondering if I need to dose the tank?