wow thank u dr2b, I have that same kinda yellow-ish film on the top of the water in Jasper's tank.
I had him for months now, but the film just started to form these past couple weeks.
what I changed is I started putting water conditioner in the water, before I just let it sit over night before doing a water change.
I'll scrub the tanks wall's when I do my next water change, see if that will help
with what can I scrub the tank wall's with, it's an acrylic tank, so I don't wanna scratch it more
ScuitoAmi150 I hope u found some help with ur problem