This really is sad news and just brings me to the conclusion that they are to be admired from a distance and as much as I'd like to give them a try, I know I will not fare any better than you did.....
We just have to accept the fact that Chocs are not aquarium fish and good luck to the select few who get it right.... I rest my obsession and shift my attentions to more achievable goals like (e.g.) firstly getting hold of, and then breeding BN's, which is not so common to do here in SA.
Not your fault Carl.