Originally Posted by Brighteyes
One more thing; make sure that they are really goldfish. I know this sounds stupid, but I have been sold "goldfish" that are really koi and grow to massitive size. (Plus three feet long and 20 or more pounds.)
All goldfish grow big, no kidding. They can also ALL live into their 20s. Koi are bigger, width wise, but comets (feeders) are just as long.
Originally Posted by centrestableswendy
To keep the ammonia levels down, I would put 1 fish per 20 gallons of water. So if you have a 100 gallon trough, I'd put 3-5 fish each, but no more than 5
This is perfect, 20 gallons per fish allows the waste to distribute enough that it will not harm the horses.
When you put in fresh water, be sure to de-chlorinate it first. Chlorine can kill fish fast.
Also, another idea, put a little shelf in one area so that they can escape in case a bird or a really hungry horse come to visit. Clear pvc with drilled holes would work great.
FYI: goldfish love peas, lettuce and worms.