We bought a fish tank, for our large goldfish who previously lived in our leaky, cold pond. I used to think goldfish were dull and stupid, but now I know this is not true. There is a difference between a fish you keep alive, and one you keep happy. They are fun and full of personality, and need stimulation.
Plants are pretty cheap and are effective if you experiment with depth and height. We chose ones with spots or pink leaves for interest. You do have to be accepting that goldfish might eat your plants.
The boy got an old terracotta pot from the back yard and smashed to make a cave for them to swim up through. Be sure to soften the jagged edges and give it a good clean first.
I put one of my coca-cola glasses into the tank. I haven’t been permitted to display my collection in the living room (in exchange for him not displaying items I find unpalatable), so was happy to sneak this in. The glass has turned out to be the goldfishes’ favourite item, as they take turns sitting inside.
I have made some bright sculpi decorations but we haven’t been brave enough to put them in the tank yet for fear it will give the fish cancer. We’re goingt o test it out on some pest fish first and see how we go.
What are strange or pretty things you have seen in fish tanks or aquarium?
Living Delilah 
Good article.