I saw Pond Pimafix at Petsmart today, about $20 for a 16oz bottle. Regular Pimafix was about $14 for a 16oz bottle. I then checked ingredients for both and saw they were the same, but Pond Pimafix was nearly 3x more concentrated. So a $20 bottle of Pond Pimafix has the equivalent active ingredient as about $42 of regular Pimafix. Seems like a much better choice for the $, but it treats 2400 gallons (240 days in a 10g hospital tank).
I see there is also Pond Melafix, although I did not see it at Petsmart.
I see there is also Pond Melafix, although I did not see it at Petsmart.