Or, I understand that an aquarium is good for your anxiety, but an 80 gallon tank is not acceptable, because it could fall through the floor.  

Aquarium full of exotic fish?

., an aquarium with a dozen fish and a pair of guinea pigs would be considered 2(two) pets. 2.An additional monthly $35 charge for each pet , irrespective of the type(e.g., $35/month for 1 pet, $70/month for 2 pets).3.No aggressive breeds.

gallon aquarium...they were part of the new landscape.

We require with your application, a picture of each pet that will be on the property.Please have pictures of pets ready to upload when applying.We may require you to bring the dog(s) to our office for approval.No Aquariums larger than 10 Gallons allowed.No ferrets, reptiles or rodents of any kind are permitted as pets.

, with attraction such as an indoor ski slope, water park, skating rink, aquarium and a submarine ride. 

I heard of a landlord who had a tenant with a letter from his shrink saying an aquarium would be good for him, and the landlord didn't allow any pets. 

I'd also limit aquarium size. 

I have had other tenants with multiple aquariums, etc and no issues there either.

Things like no dogs or no aquariums, advisement of tenants/owners rights and responsibilities. etc.