Sounds good, no more ammonia. I would still do your pwc
tomorrow. I read the nitrate test held a bit away from the card, it's seems to be accurate that way when I corss reference with my salifert test.
I wouldn't test the water each time, but every once in awhile wouldn't hurt. If they don't change their filters those nasties can get by.
I'm not sure about the bubbling algae, I haven't seen that in my tanks. :-(
Glad your fish are doing well, your working hard at it and that's admirable. Some people just give up on their pwc
's and hope for the best.