Fat Banana & Blue Cheese auto

Week 7 (06/03 - 12/03) During this week I will continue to feed the plants mainly with Bio-bloom and Top-max every two watering day; I will consider to use Bio-grow too according to the status of the plants. At the moment, the Fat Banana #1 is shorter than others about 15cm but more bushy, it's funny because during the first two weeks of their life she was the taller one. During the past week, the Blue cheese has grown a lot reaching the taller Fat Banana #2. At the beginning of this week they both are 65cm tall. I bought a pH tester so, starting from this week, I will also adjust the pH level in order to maintain it between 6.0 and 6.5... better late than never. 06/03 D43: watering day. Added 2ml of Bio-bloom and 1ml of Top-max to 3l of tap water. I've adjusted the pH with 1ml of Terra Aquatica pH- to obtain a pH of 6.4 07/03 D44: - 08/03 D45: watering day. One liter of tap water each (pH 6.4). Note: I usually fill the watering can the day before and store it into the tent to avoid to use cold water. Yesterday I tested the water and I found a pH level of 7.4. This morning I re-tested the water into the watering can before watering and I found a pH level of 8.0!!! I guess that, every watering day during which I only used tap water, the pH level has always been far high. Could it be due to an accumulation of "salt" into the watering can?!? 09/03 D46: - 10/03 D47: watering day. Added 1ml Bio-grow, 2ml Bio-bloom, 1ml Top-max and 1.5ml Terra Aquatica pH- to 3 liters of tap water. 11/03 D48: One liter of tap water each @ pH 6.0. I'm trying to lower the pH because I noticed that the Fat Banana #2 has two/three fan leaves yellowing from the bottom. 12/03 D49: added 3ml of Bio-bloom and 2ml of Top-max to 3 liters of tap water.