Need help identifying

[kp33]

I hope the pics are ok but I have had this debris floating in my tank for a few weeks. It’s not normally this bad as it collects on the power heads and what you see in the pics is right after I cleaned it off the heads. I have no idea what this is. Any help is appreciated. When it’s not this bad there’s still small amounts floating around the tank.

 

[blaxsun]

Detritus/buildup or algae growth would be my guess.

 

[kp33]

This has never happened before in the over 10 years I have had the setup and it started about two weeks after I changed my sand bed out. I have had algae before but never like this.

 

[kp33]

My clown fish just shook over a rock and a bunch of debris kicked up so yeah maybe detritus so do I need more flow to help it not settle, add another powerhead?