07-10-2010, 12:17 PM
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(I've never kept discus, so take this with a grain of salt. I've done a bit of readon on the subject though.)
The only reason for the massive w/c's, are because of the Beef heart. Professional breeders feel their fish beef heart to 'bulk' them up, and induce them to breed.
Personally, I prefer my tanks to mimic nature- Do you think a Discus in south america has ever come upon a dead cow, and then proceeded to eat it's heart?
You CAN keep a pair of discus in a 40, but it's true they might not reach full size. By full size, I mean the wize they get to if they eat lots of beef heart.
The bare minimum, according to several sources, is 10 gallons of water per fish. I'm not sure I agree with that, because it's calculating a group. Something like a 60 G for 6 still seems overstocked, but I've seen pictures of a 40G with a breeding pair. They only grew to about 9 inches long, but seemed healthy and spawned multiple times.Temperature was 80 degrees, heavily planted.
Many fishkeepers hold their Discus at 82-84 degrees to avoid illnesses and speed growth, but according to fishbase that's NOT the temperature in their native enviroment. I suppose it would depend on whether you got a wild-type or a super-colorful captive bred (in-bred) species.