Which is better? In your opinion.... I have both, but I've really only used the Aqua Plus in the 10 years or so I've been keeping an aquarium. I notice it says 1 cap of the Aqua Plus treats 10 gallons, and the Prime says 1 cap for 50 gallons. That's quite a difference!! And if/when I use the Prime, how much does that treat for 10 gallons? About a quarter of a cap? Do I need to worry about adding to much Prime? Should I get a dropper and measure out 1ml which is a bout 10 gallon according to my calculations. What do you all experts think?