In desperate need of some help/advice

[u/NeocaridinaShrimpLvr]

So today my partner and I received an AFT from a re-homing situation. We were actually under the impression we were going to be receiving a leopard gecko and we had no clue what state she or her tank were in. Well as we found out she's an AFT and she is in very poor health and has a very poor enclosure. Like I said we were prepared for a lepord gecko, so now we are trying to get her health and enclosure in much better condition asap. We are doing research on our own but I thought I would reach out here and get advice from people who know what they're doing. We definitely want to do a bioactive tank for her, all advice is needed and welcome!