halfmoon X Crowntail? HMdoubletail X Crown tail?

[squal90]

what would be the outcome?

[cajunamy]

hm x ct would be halfsuns and possibly some not great looking fins. from what i understand, a nice looking halfsun is rare...

not sure on the other one ...

[DarkMoon17]

Avoid crossing CTs with anything but another CT. You will get a whole bunch of fry with inconsistent spiking. It will take several generations to get a nice halfsun/combtail and it is hard to find homes for CTHMs or CTDTs because it is a undesirable trait.

[bettafish15]

Yeah, as said, the outcome is very undesirable. It muddies up the gene pool, IMO. Just stick to CTxCT. :)