I'd never have fish @ all if I listened to all your tank standards. It's great if you have all these 180 & 500 gallon tanks. I don't have the space. I have to do the best with what I have.If I have to put a parrot, 3 rosey barbs a pleco, a large fancy goldfish & a medium comet in a 30 gallon tank, that is what I have to do. I guess I just do not have the space & money that you guys do. One of my grandaughters has had the same golfish in a bowl for over 2 years now. Lots of people say that cannot be done either. Maybe sometimes we have to push the limits @ the same time providing the best possible living conditions. I'm retired & have all the time in the world to devote to my 2 favourite hobbies. ( plants & fish ) I do the best I can do with both ! I have had aquariums for 50 years now & have done many things that people told me couldn't be done.