My azolla and water lettuce are starting to show reddish coloration and
the water lettuce is losing a few leaves. Nitrates are nearly zero
since I only have 7 small, lightly fed fish (if that many) in about 70
gallons of water. In a planted fishtank I'd add nitrate to the water.
Should I do the same in my 3 barrel pond?

I understand planted fishtanks well. Do I handle pond plant nutrients
the same way for oxygenators and floaters? I usually add trace
elements, potash(K) and iron to the water routinely, and nitrate (or
even phosphate) if necessary. However, I don't know if there are
"gotchas" to ponds since they seem somewhat different from aquaria.

Assuming that I do need to fertilize, can anyone suggest a good water
garden fertilizer that will work with a very light fish load and lots of
plants?

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__ Elaine T __
__' http://eethomp.com/fish.html '__