That sucks that you have to move! Would he maybe agree to the tank if you offered to increase your security deposit? Are you able to show insurance noting he's covered for any loss as a result of the tank exploding or leaking, water damages? Does your lease agreement state anything specific about pets?
I get you are at the point where it doesn't matter with this current landlord, but likely something you should be up front about with your new landlord to ensure you get into a place knowing you won't have to move anytime soon as a result.
Regarding rent increases - you really are at the mercy of the landlord on that one, there's nothing in Alberta limiting residential rates or annual increases. If a landlord doesn't like you, they can raise it whatever they want.
gl!
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