Altum wrote:

How can something that contains ammonia not be toxic to fish???

The fertilizers mentioned contain ammonium, not ammonia. Really close, but
_much_ less toxic.

Ack.
Even tiny amounts of ammonia in the water can stress fish and affect
their health and growth, whether or not you see an immediate toxic effect.

But I tend to agree with you, anyway. I haven't fertilized since my very
early water-gardening days, and I get more blooms than ever.
--
derek
- Unless otherwise noted, I speak for myself, not rec.ponds.moderated
moderators.