Aaron wrote:
Ok, the more I'm trying to set this up, the more confused I
get. I thought about those Koi ponds outdoor in full sunlight.
How come they aren't covered in algae.

Koi ponds that are naturally algae free often use a bog filters. That's
a big tank or pool with lava rock in the bottom for biofiltration and
fast-growing plants like water hyacinth, anacharis, or watercress
growing in it. It's the same principle of fishtanks - higher plants
will outcompete algae if there are enough of them and the right kinds of
nutrients. Ponds are also generally shaded with lily pads or floating
plants to reduce the intensity of the sunlight hitting the water.

--
Elaine T __
http://eethomp.com/fish.html '__
rec.aquaria.* FAQ http://faq.thekrib.com