i have a 40 g salt water tank and i just had a Scopus tang and a clown fish die on me from what i think was ich the tank has been running for about 3 to 4 weeks and the water is really dark cloudy my other clown is acting really weird to am i missing something i and very new to this i need as much advice as i can get thank you sooo much for the help oh and i have a aquaclear power filter and my salinity level is at 1.023...