Aquarium content might be the most worthless pet content in terms of earnings potential from views on YouTube. I'm pretty sure there's only one dedicated aquarium channel with more than one million subscribers and his views per video have shrunk dramatically in recent times. Aquarium co op is probably the most actively viewed aquarium channel and i believe he has said that they earn ~$9,000 a month from youtube, but that's including the revenue from the large paid membership base they have. You'll also need to educate yourself on youtube SEO to even stand a chance at making any amount of money and spend a lot of time editing your videos, as well as stick to a dedicated upload schedule. In terms purely of money making it's probably a poor choice. In terms of just showing off your aquariums than i don't see any reason why you shouldn't do it, though.