I have 2 or 3 years experience in keeping a live rock / fish tank. I have over 20 years experience in keeping FW. Anyway a friend of mine's future daughter-inlaw owns a business and has a hex type reef tank that is in very poor condition. Mostly just rock and a few inverts. They have 2 fish a clown and a 6 line wrase also have a octopus. (I have zero experience in keeping them). She said she thought it was a 60 gallon tank but if I guess it maybe smaller. The person that was taking care of it had quit and in our small town they are very few people if any that does tank maintenance but I told them I would do it. They wanted someone they could trust if they needed to go after hours. She said they had had some fish that had died. I asked if they been changing water and her reply was she just added water. (no chlorine remover)I thought that was good untill she said they been added tap water. Anyway Im going in 2 days to do some maintenance. Did not have a hydrometer so have no ideal what the SG is. So first Ill check the SG and amonia, nitrites and nitrates. I'll also do a water change. I'll also replace the Tetra Min for some better fish food. It does have a nice UV steralizer and canister. Thanks for any advice especially with octopus.