Who to breed?

Well it seems a will have a tank available for spawning much sooner than I thought. The plan is a 14g which may have 4g sectioned off for my last OAP betta (though I guess he could share cory space or elsewhere as pretty docile).

There is horrid multicoloured sharp gravel in there at the moment, the choices are get some play sand cheap or use up pea gravel have left over that the cories would plan breeding have already in use in their home tank?

Also who should I breed out of the following:

Caudimaculatus - these have spawned at least 3 times aware of, a group of 6, unsure if moving them would undo the magic to the fact that they have spawned (heard not to mess with success?)

Gold Peru - unsure how mature these are have a group of 10 not spawned as aware though community tank so they could have and eggs eaten. Will be pming seller to ask how old but unsure?

Thanks for any help and thoughts! xxx

Ohhh The Gold Peru ones

Thanks sweet pea

Trying the killies in there for the moment as believe the female is pregnant, just preparing some mops for them. Will need to wait till feb payday to get some sand and try some cories! must find out how old the golds are..