I have way too many tanks, I have a 12 gallon glass top in the front sitting area, then I have three tanks in the living room, two 6 gallons one with wild guppies and the other with fancy guppies, and a 30 gallon mixed tank in the living room too. Then in the kitchen there is a little 10 gallon tank with auatic little frog and pladdies. In the spare room there is a 90 gallon fish tank with a really big Tin Foil Barb that eats dog food!!
Last but not least, in my bedroom there is a 27 gallon long tank with upside down catfish (they are cave dwellers that swim upside all the time) and I bought him in 1991! You can do the math and figure out how old that fish is!! He lives with wild guppies and eats many of them, as well as frozen brine shrimp too! That tank is as old as him, and I never take it apart or move him, just do part water changes every few months. Hubby and I never knew they lived forever!!!
All my fish tanks have live plants and nothing plastic, only real rocks or real glazed ceramic pieces and lava rock too. I do not put plastic ornaments because they are toxic and the algae that grows on them is also toxic to algae eater as the algae that grows off the plastic grows black and blue, and black and blue algae is toxic. On real rocks, wood or glazed ceramic ornaments, the algae grows green and healthy.