It's a trip that fish from the same brood can react differently. One oscar is fine. One pbass fought it off and is fine.
All these fish are like my dogs. Up in the morning greeting me. Splashing wildly.
When you have fish like this you don't just give them away when one of a pair dies. You got to stick with them and take care of them. (That's me).
I will have to start a thread on this subject some day.
Here in Panama, Oscars have become well established in Lake Gatun, a very hard water parameter body of water, where pH often rises above 9.
My guess is, there were 1 or 2 of a spawn many years ago, that survived while 999 or 998 of a spawn perished, and the 2 that did survive passed along the genes that allowed them to breed with others of that hard water while less robust individuals ilk didn't and these have eventually populated the lake.
The P bass here are very also well established, but.....they are however 1/3rd smaller than the true Amazonian Cichla. A plus or minus?
6 were accidentally released in the 1960s, so many that couldn't handle the hard water didn't get to pass on those soft water genes.
In nature this gauntlet of the survival of the fittest is what allow the genetic alteration to happen over time, whereas in a breeders tank,
one that tries to produce as many sellable juvies as possible, and especially a breeder that alters water parameters to match nature, short circuits that tough survival gauntlet (in a way ) not doing any favors to those hobbyists stuck with hard water.
Of course what breeder can afford, or wants to wait that 60 year span that it might take to get that thriving hard water gene pool established fry
It might be interesting for someone ambitious to come along, bring a couple of these hard water type PBass and Oscars back to the US, and market them as hard water tolerant variants.
Profitable?
Will aquarists be willing to pay the premium needed, for something they don't quite understand, or believe in, like the water parameter vulnerability.