None of my tub ponds have any filtration or areation other than the natural
from the vega mat and the wind and rain. They stay really clean and clear,
unless some garbage or animal falls in and goes undetected. I use several
ponds like this, some are the larger preformed ponds from the store, then
some barrels cut in half, and then some assortment of tubs that are all
roughly 8 inches deep, 2 feet long and 18 wide. All my ponds are sunken
into the ground to hold heat at night and keep cool in the day. It works
great for getting many tiny species of fish, native or not, to spawn, as
well as non fish critters.
Ray
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