@Charestv, welcome and sorry about that. I did the same exact thing and all I put in was decor, plants, (not live) and water and fish and water conditioner…it didn’t go well as I lost my betta who was the only one in there in the first month or so…I have learned and I understand the cycle and I would def like o help u if I can..jus like @Rewcolee1 said I am not super smart on this kind of stuff but I have learned a ton and hope to help you @Charestv! I suggest getting a bacteria booster for this tank as this can quick start the cycle of the in fish cycle. How is your remaining fishes health? What conditioner did you use? How long did you wait toput fish in? I hope to help..but trying to think of better Qs but hope you can answer these so I can do my best!