Hey guys. First time renter here, wanting to ask 2 legal/rules

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Hey guys.

First time renter here, wanting to ask 2 legal/rules questions regarding renting a unit.

The company has a rule (And I should mention, it's the rental company, not the owner) wherein that if you have a guest stay, you need to request permission ahead of time, and if they do, you are required to pay $20, or forfeit an amount totalling a weeks rent ($220)

This rule applies to your significant other, and in addition was not disclosed on their website, and only announced in paperwork as I signed the lease (And had already paid down a security deposit and 2 weeks advance rent)

I want to know, by Australian and Queensland law, if this is legal - if I have my girlfriend over, and they attempt to fine/charge me or claim a breach of lease, do they have any legal grounds to stand on?

Specifically relating to this rule, I did not formally sign an agreement merely initially a page.

Second question is, would a small tank (500ish cm tall, 300cm octagonal tank) count as a "pet"? I have been getting conflicting information to whether or not fish classify as pets, or decorations, and may have to wait 2-3 weeks to hear back from the landlord via the real estate.

Any advice on these matters, specifically the girlfriend rule would be greatly appreciated, as I want to have my ass legally covered/protected against this fuckery - last time I checked I was renting a private unit, not living in a nunnery