CichlidDan
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I was thinking about breeding starlight plecos or blue phantom plecos, my question is would a 20 gallon either high or long work or would I need something bigger?
NO.
Starlight (L183) are territorial from a very young age. I've had them kill each other in a 20-long at a small size.
Blue Phantoms are also territorial, much more-so than any ancistrus species. They get to be 8" long and need well-oxygenated, clean water. You should look up breeding information on them - getting them to spawn at all is not easy.
It depends which type of starlights. I have L182s which are still young but doing fine in a 10g. They will later get their own 20g long, but they seem to be very passive.
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I have an old issue of Amazonas that had a breeding report of the Green Phantom plecos. I don't remember if they were the baryancistrus or the hypancistrus but I do remember the tank was a 40br with lots of stacked slate rock work. I'm purely guessing that green phantoms would spawn comparably to blue phantoms. As Matt suggested, planet catfish.com is the place to check out.