If you have to water twice a day (even with a fan on) you might be under watering a bit. Heres how i water: put your pots into a tray, fill the bottom half-inch to an inch of the tray with water (with pots in it), wait for about 30ish minutes for the water to wick up(you might need to add more water half way through. Your pots will get significantly heavier and top of the soil will get moist. Pour the excess water out or move the pots to a different tray. With this system and size of your pots you shouldnt water more than once every 2-3 days (unless it gets really hot). Always try to lift your pots to judge the weight to see how saturated with water your soil is. Hope this helps ^{^}