Isolation Tank / Hermie Playground by KyMart

[KyMart]

I have been thinking about getting a 5g fishtank as a isolation tank and a hermit playground, I want to get them tons of toys and put them in there, and put them in there to play a few times a week as a treat. Thoughts on that?? My tank has to be space efficient, I have two PPs in a 10g, but I want to give them a playground so badly!! I could also remove the playground and use this tank as an isolation tank if ever needed, so it would be good to have on hand, BONUS! Thoughts on the idea? I don't want to stress them out!