White debri

[Kess002]

So my son’s tank is over a year old and has been doing well. The light died for a week so I bought a new one and cleaned the tank. A week later it looks like this, was clear before and now has white spec like things. They don’t move, seems more like and algae. Thoughts? Do I do another water change or see if it clears out on own?

[Guppysnail]

This looks to be an accumulation of excess mulm and food particles.  I would do a good vacuum and use a turkey baster to blow off excess to be siphoned out.  Cut back on feeding and increase flow if possible maybe add a bit more mechanical filtration.