Thanks for all the thoughtful replies. I haven't seen many topics where the 
opinions were unanimous (GRIN) ! This may have been one of those "freak 
out" things referred to, as I had been running it such that only the thick 
brown sludge pumped out (about half a cup/week). When it really started 
pumping mostly water I tried cutting the air way back and changing to new 
airstones, but if there was air pressure enough to make bubbles reach the 
top, it brought mostly water (and too much of that).
         Given the improved look of the inhabitants, I'm going to scale 
back it's use, gradually increasing the amount of time per week that it 
gets run. I guess common sense says, let the critters be the judge. I just 
didn't want a disaster to creep up on me (them).
Thanks again,
Larry


"Black holes are where God divided by zero."
- Steven Wright

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