I love seeing all the tanks on here with their crystal clear water but it seems I have a problem on my own. I own a 75 gallon that has been running now for around 5 weeks. I currently changed the gravel on it o black and the water isn't as clear as I want it to be. The tank is 4 feet across and you can barely see to the other side! The filtering I believe is fine as there are barely any particles in the water and I'm running an xp3, a mangnum 250, and a powerhead. I have heard that it might be the driftwood. Any thoughts?