Filtration consists of a custom made under gravel filter to draw water from the bottom of the tank to the top. From the top of the tank the water drains from the back into a wet/dry filter.
I don’t’ care if the viewer doesn’t like goldfish or thinks it’s a waste of space. I like them and it’s my space to waste so get over it.
I’m also NOT adding more fish. This is just like keeping any other pet where the QUANTITY of life with in a given amount of space does not equal the QUALITY of life with in that space. The animals are happier, healthier, and easier to clean up after with so few in the aquarium.
Those looking for help with sick fish please feel free to message me. I’ve been keeping and studying fish for 24yrs with 10yrs devoted to aquatic rehabilitation. If I can’t answer your question I can help you find some one who can.