So I have a 20 gallon tank that I just tore down from fresh. I want to turn into a saltwater tank, fish only. However I'm not in a position to drop 300 bucks. So I was wondering if I could get some sand, salt, small rio pump, (65 gallon is good.) Salt-ometer (too measure salinity), basic test kit (pH, Ammonia, Nitrite, Nitrate), and a small over flow box like thing all for around 100 dollars.