Endlers are pure but this color variation was developed buy using hybrid breeding by Adrian from swampriver aquatics think that's the name but mine have only been by themselves so not sure how to answer that once the color pattern was developed by Adrian then they breed true but don't think they occur in the wild if that helps
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Still have the loaches, and only have some Briggs no more giant rams I shipped them all last year
Only fish now are endlers and rest inverts and plecos