I have a 125 and has been set up for a year. I Just saw a hint of trates today and did a water change about 2 weeks ago....I have never had any hint of either trates or trites in a long time...is this solved with a water change? I have 3 shrimp and 2 starfish and dont want anyone killing over on me...Also running an Aqua C skimmer...Since its just a hint should I let it roll or do something about it?