Hi, if you have done your research you should be ok. Make sure you change there water daily, spot clean when needed and change his/her substrate once a month, give him/her their vitamins and you should be ok. I keep mine in 10 gallons for males and 20 longs for my females, some people prefer exoterras and some just use a basic tub, its really what you would prefer out of the three. They will do good in either one. For illnesses there like any frog, if you have good husbandry practices your frog should be ok. The most common thing I find with these guys is impaction due to the fact they aren't the best at catching food on the first try so they end up eating substrate, they usually can pass the cocofibre but the odd time they will get a lot and they get backed up. A warm bath with a few drops of honey usually does the trick, if this ever happens make sure you give him a second bath after to get the honey off. A good way to prevent this is to get him used to tong feeding as soon as you can. If he doesn't eat for the first few days don't stress they tend to do this when adjusting, sometimes you will get lucky and they have no problem adjusting and eat right away. Make sure you keep temps in the low 80's and let the temp drop at night and he will come out of his burrow and want to eat. For cage furnishings a water bowl and a couple plants ( fake or real ) for him to hide under is all you really need, they are pretty easy to care for. Cant really think of anything else at moment but if I do I will let you know and I imagine some others may have some advice. Hope everything goes well for you and enjoy your new froggy friend when you get him.