https://www.parosphromenus-project.org/en/forum/13-Trade/152-stocklist-of-an-oregon-dealer.html
its an old post but if you look down somewhere theres a mention of an ‘angel licorice gourami’ – this should be anjunganensis.
Does your fish have any colour band in the tail ? If not it could well be anjunganensis also.
I dont know this sand, – but most sand will affect the ph though, or make it difficult to maintain a stable low ph.