If you sent Bitcoin to an address which is not a valid Bitcoin address, you have lost it. There's nothing you can do about that and Bitcoin addresses are irreversible
That but it should not be possible. Software clients have build-in security for this, to not allow send payments to not valid Bitcoin addresses.
Maybe this website/exchange u used doesn't have such security in place? They should :/
That may be a valid Bitcoin address too. But I expect Tux Exchange have the control of the private key of that address only on crystallbits network, which will not help you at all.
In some distant future, somebody will generate the private key of that address on the Bitcoin network and will have a nice surprise.
But realistically, I'd count those Bitcoin lost for humanity.