My name is Joseph, born raised in Washington. My first aquarium was a 45 gal. fresh water tank at the age of 15. Being such a big tank I got sick of cleaning it. Now being almost 20 I have missed having fish and wanted to start up a new tank. I found a decent looking 20 gal. at the GoodWill and decided to customize it. A week later I have carved a unique wall out of styrophoam and covered it with conrete to give it an organic look. Letting the concrete cure for 3 days totally submerged I emptied the water and replace it with fresh tap water. A day later I buy 4 neon tetra to basically test the water to make sure the styrophoam does not poison the fish. A few days later my four tetra are still alive with large traces of ich. To kill the ich I have added one tablespoon of salt per 5 gal. of water (being 3.5 because of the size of the conrete wall) and raised the temperature to ~80 degrees F. Five days after adding the salt and raising the temp. the ph level is at 8.2 (because of the concrete leaking lime and I am guessing becuse of the salt) and I am typing this intro watching my 4 tetra barely hanging in there with no sign of the ich dying. I have a couple questions. One being, how long will the conrete leach out lime, raising the ph level. Because I really would like to have some tropical fish and plants in my aquarium!