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They sell them because they're in demand. I don't think it's necessarily about profit, because it wouldn't put a dent in their income if they stopped selling them. They just want to be able to...

I've read that the rule of thumb is 1 inch of fish per gallon. In my opinion you can stertch that rule a bit (as long as the fish seem happy), if you have fish that are smaller in width and height....

I have a book that contradicts what you read on the internet. The book says that doing large water changes is a good thing rather than just changing small amounts. It recommends doing large water...