we do have a faq someplace but part of the problem is we have ponds
from below sea level to 8000 ft elevation, USDA zone 10 to zone 3, in
most of the United states England Holland Austrailia Canada Africa,
some of us with veggie filters, small to masive bio filters, no filters
atall
we ar keeping Koi Goldfish Sturgeons bass carp et all in the ponds
from two or three to a couple hundred
there are just too many variables to come up with any hard and fast rules

This is the whole point of data mining. There are too many variables and
people can't see the patterns or rules. So mathematical techniques are
used to find correlations in the data. Given the wide variety of ponds
maybe 5000 surveys are needed, I don't know. But the more there are the
better.

all we can do is ask a question sift through the solutions and hope we
choose the one that will work in our particular situation.

Again, data mining might remove some of the guess work.