Fish aren’t the sole incredible creatures that live in fish tanks. Amphibians and invertebrates make excellent pets too! They’re mentioned as critically endangered, with their figures declining as a result of overfishing and habitat destruction. Like coelacanth, they've minimum genetic variation involving populations, making them far more prone to disease. https://sites.google.com/view/aquariumshoponline/how-to-maintain-a-2-feet-aquarium-bigger-fish-tanks