It's been interesting following this thread. I'm seeing some really good, solid info...and a little that's less than accurate.
I started keeping discus in '89, was told by the breeder to keep them well-fed, warm and their water clean, which I did. The four Schmidt-Focke hi-fin brilliant green #5s grew into monsters.
I was hooked and have pretty much kept them since then.
Many think it's necessary to keep a fish in the same EXACT conditions in which it evolved. We hobbyists are finding that this isn't true.
Discus come from soft, acidic water, true. As mentioned,they will adapt to a wide range of hardness and ph, though. I currently have wild green discus which live in sometimes 700 ppm TDS with a nominal ph of 7.6...they're thriving, and a pair just spawned two days ago.
Fish have no receptors for ph and have no idea what the ph of the water they're in is. What we often call ph shock is actually osmotic shock from the TDS differences we subject fish to and not the ratio of hydrogen to hydroxyl in the water. Robert T. Ricketts explains this ph myth in several of his articles which are must reading for any hobbyist, IMO.
Acidic water may have the ancillary effect of rendering ammonia less harmful than higher ph, but that's not why discus keepers keep the water acidic. Acid water duplicates the water condition they originated in. Ammonia is controlled in the successful aquarium by other means. Also, while an acidic environment serves to inhibit the growth of harmful bacteria, it's a double-edged sword. Acidic water also inhibits the growth of the bacteria we want to encourage, the nitrifying bacteria which process the ammonia and nitrite for our fish. That is a primary reason for the early discus keepers to do daily water changes. Biofiltration is difficult in warm, acid water so ammonia was managed through large daily water changes. Thankfully, discus are highly adaptable and thrive in higher ph and TDS than in that which they evolved.
They are not the delicate flowers that some folks feel they are. Discus are tough fish that come from a very hostile environment. Anyone who's ever bought a wild discus with a swirl-patterned scar from a piranha hit will attest to that.
I've raised both discus and angels. Both have their challenges but the same advice I got from that original breeder still applies...to both...keep 'em well-fed, warm and their water clean.
No magic required to keep either, just good, sound fishkeeping practices and ethics.
Mark
I started keeping discus in '89, was told by the breeder to keep them well-fed, warm and their water clean, which I did. The four Schmidt-Focke hi-fin brilliant green #5s grew into monsters.
I was hooked and have pretty much kept them since then.
Many think it's necessary to keep a fish in the same EXACT conditions in which it evolved. We hobbyists are finding that this isn't true.
Discus come from soft, acidic water, true. As mentioned,they will adapt to a wide range of hardness and ph, though. I currently have wild green discus which live in sometimes 700 ppm TDS with a nominal ph of 7.6...they're thriving, and a pair just spawned two days ago.
Fish have no receptors for ph and have no idea what the ph of the water they're in is. What we often call ph shock is actually osmotic shock from the TDS differences we subject fish to and not the ratio of hydrogen to hydroxyl in the water. Robert T. Ricketts explains this ph myth in several of his articles which are must reading for any hobbyist, IMO.
Acidic water may have the ancillary effect of rendering ammonia less harmful than higher ph, but that's not why discus keepers keep the water acidic. Acid water duplicates the water condition they originated in. Ammonia is controlled in the successful aquarium by other means. Also, while an acidic environment serves to inhibit the growth of harmful bacteria, it's a double-edged sword. Acidic water also inhibits the growth of the bacteria we want to encourage, the nitrifying bacteria which process the ammonia and nitrite for our fish. That is a primary reason for the early discus keepers to do daily water changes. Biofiltration is difficult in warm, acid water so ammonia was managed through large daily water changes. Thankfully, discus are highly adaptable and thrive in higher ph and TDS than in that which they evolved.
They are not the delicate flowers that some folks feel they are. Discus are tough fish that come from a very hostile environment. Anyone who's ever bought a wild discus with a swirl-patterned scar from a piranha hit will attest to that.
I've raised both discus and angels. Both have their challenges but the same advice I got from that original breeder still applies...to both...keep 'em well-fed, warm and their water clean.
No magic required to keep either, just good, sound fishkeeping practices and ethics.
Mark