Yes at a chain store this guy has alot of tanks and his really knowledgable and he says a 75g is like a 10g to him.Oh geeze. Lovely. Is there a good LFS near you where you can trust their advice? Or a paticular LPS employee you have found to be knowledgable? I know they do exist, the best way to spot them is ask them about their tanks.
No I never eat vegetibles besides bannanas and no I very rarley get constipated.You never eat vegetables?You must be terribly constipated! I mean, you're in danger of all kinds of health problems without veggies in your diet.
There are things that your body needs that it can only get from vegetables. I am more worried about you than I am about your fish.