I had been encouraging my friends who also love to pet fishes to use recyclable stuff for their fishes instead of buying new ones. This is for them to save money from spending those new stuff and also to help minimize trashes which are yet usable.
Reusable TV as Aquarium (image from boredpanda.com)
One example is the image above. As you can, that is an old television set. But there are other old items which we thought are not useful anymore at home but still can be used as aquarium. A very good example is an old speaker. Of course, you cannot just use iloud speakers since those are small. Utilize the bigger speakers so that a number of fishes can be accommodated.
I have not tried one yet since we do not have old speakers here. But I will make sure to share to you here once I got to make an old speaker as an aquarium.