Andy Sager
Aquarium Advice Addict
He has never peed outside of the box, but the charcoal idea might work.
Does algae produce ammonia? We have an algae problem while we get the co2/lighting and minerals all balanced. Our new lights just got here and we got a new diffuser for the co2.
The charcoal idea was for ammonia fumes absorbtion from the air. I don;t think that would work in your case. To my knowledge, algae doesn't produce an ammonia problem unless it is dying off. You may need to go with an ammonia absorbing product like ammonia sorb or Zeolite or a polyfilter type pad. These would probably work better once the sand is cleaned a bit.
On the cat pee issue, how would you know if the cat did pee in the tank? lol Has he/she ever climbed on the top of the tank? If your tank is open and the answer was "Yes", then it IS possible it peed/ pees in the tank. I'm just saying... Got a video camera? Is the cat ever alone in the house with the tank? You thinking what I'm thinking????