Hey guys i have a new 40g established tank i has finished its cycle a few days ago so i introduced a clown fish to the tank how ever it has been swimming at the surface of the tank since it got here it feeds well and everything but it just swims still at the surface i have two power heads and one spare one , my salinity is 1.025 and my ph is 8.4 before adding the fish i tested my water parameters at my LFS i dont remember what they were but ammonia was 0 and the guy at the store said its safe to add fish , i havent done any water changes cuz frankly i dont know how and my RO system hasnt arrived yet so the only available water is tap water , if you suggest a water change please consider that only tap water is available and that i have no clue how to do it , thanks in advance