Hi i`m a new to the fish world.. i have a 24gallon tank that has live plants with a co2 system, which i`ve just finished cycling. i`ve had my 6 tiger barbs for 3 days and they have not eaten anything yet, they they hide in the caves or behind the plants at the bottom of the tank.. is this usual or is there something wrong in the tank, ammonia 0, nitrite 0, nitrate 1