Glad you dug up this thread sparkymach, so I can chime in. Big welcome to AC!!
First time I tried pacific blue dempseys, I bought a single 1" fish for $20. I had it for oh, 3 months I think. At first it would only take live worms which I didn't like, but at least he was growing well on them. I moved him to my 29g once he was large enough, with some harlequin rasboras, angelicus loaches, marbled angelfish, and a GN plec I believe.
The dempsey was doing fine and growing well, then just started hiding, stopped eating, and died.
When I first got him:
Grown out some:
This was taken only a week or so before he died before odd behavior:
I wasn't going to give up that easily though. I went back when a different shipment arrived (a few months later) and bought two.
These were small. Appx. .5" and I decided to put them straight into the 29g instead of growing them out somewhat in the 6g.
To my surprise, right after I introduced them, I offered flake and bloodworms, which they took eagerly. They grew fast:
They started showing differences between the two. After moving them to the 180g which at the time had some oscars, clown loaches (still have them), bala sharks, angel fish, etc... they did okay for a while, but this one died:
And this one is still alive today:
Most recent shot of it:
The one that has survived, has survived two feeder fish/worm induced cases of ich, as well as the treatment periods.
He's not shy, though he does spook easily. But as long as I'm not jumping around my tank, he does swim up the the front when I'm feeding and follows my fingers somewhat, and gets in the way when I'm trying to take pictures.
I agree with earlier posts that the recessive gene is definitely linked with some other trait that causes fragility.
Just because you've had no luck with a fragile fish is no reason to call it worthless IMO. I've struggled with GN's, and finally had one that was eating well and doing great, which died in a recent move :mad2: .
One last note: blue dempseys look like crap under yellow spectrum lighting (i.e. 6700k). Use bulbs higher in blue light (10k, or if you have a planted tank with 6700k, use an actinic bulb), which will make your dempseys look gorgeous! Mine looks like crap under 6700k right now, so I will add an actinic light to do it more justice.