Best to assess how many people would be interested. a sample of macros for $3 and a sample of Micros for $3 might suit a majority of people. Going by a drop a gallon will likely last several months. Would this be fair to everyone? remember we're going to start slow with the PPS Pro
method targeting smaller tanks but it may be applied to larger tanks equally in larger doses.
I would be interested. If there are many people interested, I can also help you guys put it together or split up the costs.