My local pet store owner told me to feed both my 37-gallon tank and 18-gallon tank tropical freshwater fish every other day. The manager at the store said every 2 or 3 days. The label on my fish food container says 3 times a day. The Tetra brand brochure that came with a kit I bought says 1-3 times daily. I've googled it and I'm coming across a lot people who feed them once daily but only 6 days a week and make them fast one day a week...yet still I'm finding all kinds of different answers. I'd like to feed back here. Why is my local pet store owner (who's been selling fish for 30+ years) saying only once every other day when that answer is the most uncommon one I'm finding on the internet? Thank you!