Hey I have 2 tanks both around 40 gallons. One of them has gold fish and the other is tropical and has a huge mixture of fish. Im abit anoyed about fish store rules the one were you have to be over 18 to buy Because Im 13. I understand were there coming from making that rule But you would have thought After I shopped there for over 5 months with about 1 visit a week They would let me. AND They wouldnt even let me buy the ph mixture :?: . Just wanted to share that with you all comments welcome