Two known breeding from PVC that I know of, both locally.
You can also silicon the outside and coat it with your substrate.
This will make it look more natural and plesant to look at.
Also, make sure you "anchor" it to the substrate by digging it in.
Otherwise they will tumble around your tank when they are fighting for the cave.
Then it will turn into a mobile home and not be very condusive for breeding!
When the fish want to breed they will find a way.
Some have been known to breed in crevices in driftwood or natural stone too.
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