Is breeding brother and sister a no no like

[mainbutter]

It would take a few generations to start seeing problems from inbreeding

You can breed sibs together without problem.

I'd say neither of these are perfectly true.

One of the risks of inbreeding, and one of the risks of most concern with single-generation inbreeding, is if there happen to be any recessive genes that cause problems in the mix.

There are risks, you might see problems from a single generation of inbreeding.

However, it is my opinion, and certainly the opinion of the two people I quoted, that these risks are small enough for inbreeding, at least to a small degree, to be acceptable.

In addition, snakes seem to be somewhat less prone to uncover problems from inbreeding (compared to mammals). In the wild, there is plenty of inbreeding happening in many reptiles, especially isolated localities.