come under fish tank with fish?
Doesnt matter what you and me think they are it more depends on the landlord/s, id say theyre pets IF the landlord thinks so, so imo it wouldnt hurt to ask if its ok to have a fishtank, but may do if you dont in the future if in the unlikely event of damage to carpets etc
most landlords dont mind a fish tank nor understand mts so best to let them know b4 mts really kicks in lol