Should I be concerned and what should I do

[mecac]

Any concern or suggestions.  I stood up the 120g tank around Labor Day.  I transferred most of the water from the old 75g into the 120g.  New gravel and new Fluval FX6 filter.  The light sits above the tops about 3"- 4" and inside the canopy.  Does the water seem hazy?  Just doesn't seem as clear as the 75g tank was.

[Ron]

New substrate - if it wasn't 100% clean, some of it could be dust from the substrate.

I'd suspect no matter, whether it's a disrupted nitrogen cycle or particulate, it'll clear up in time. I'd only worry if the fish were gasping for air and/or had extremely red gills (all a result of high ammonia levels impacting gill function).

[mecac]

Thanks Ron.  Fish seem fine so I believe the balance is OK.  I did wash the substrate the best I could.  I plan on a water change in a couple of weeks so we'll watch for some improvement.  Much appreciate the quick response

[Regalblue]

New substrate or bacteria bloom. 

What are your parameters showing?  Keep an eye on things.

You would've been better off with old filter pads/substrate  & new water.

[Stan M.]

x 2 on that.

[GrizzlysDad]

If it's near a window getting sunlight it could also be an algae bloom.