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Floating plants and current
I'm finding that the water in the lower two barrels of my pond is too
turbulent for small floating plants. The water lettuce seems to ride its way to a quiet spot against a marginal and stay, but the azolla gets pushed under at the spillway outflow and tumbled around underwater. Then its roots fall off and clog up the filters. I've finally netted most of it out of the lower barrels, except for some that's more or less "corraled" with black airline tubing because the fish need the shade. Not exactly elegant. Even worse, I learned that azolla fixes nitrogen. I now suspect that the nitrogen fueling my green water is from decaying bits of azolla roots everywhere - I had a nitrate source and didn't even know it. I wanted lilies but don't know to tell whether conditions are OK for them in the lower two barrels. Flow is about 200gph through the spillways connecting the three half barrels, with the spillways ending about 2" above the water surface for light but not excessive splash. From watching azolla and submerged plants, the current tends to flow down from the spillways, up on the far side of the barrel, and splits to flow back towards the spillway around the sides. I tried to set the ball valve at the lowest setting where all the debris (currently Cambomba leaves and azolla roots) ends up in the bottom barrel with the filter. The top barrel is different because it has the pump outflow at the bottom so the surface is less disturbed. Can anyone take a guess about lilies or suggest other large floating plants that are tolerant of this sort of current to shade the pond? And legal in California - I can't find water hyacinth and only got water lettuce through a friend. Or do I have too much current? Thanks so much...again! -- __ Elaine T __ __' http://eethomp.com/fish.html '__ rec.aquaria.* FAQ http://faq.thekrib.com |
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