Collection of gunk behind ornament

CatFishmom7

Good afternoon fish keepers!
So I have another question about my fish tank. My first post was about this fluffy white stuff all in my tank and not knowing what it was. Actually keeping up on water changes has helped but I still have a buildup of stuff not sure what it is or what it’s from. We’ve cut back significantly less on feeding because that’s what we though the problem was. But we’ve also noticed our blue glowlite tetra has gotten smaller.. I’ve attached pics and video! Last night I did a gravel cleaning and took out the cave with all the stuff on it to clean.
 

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JustAFishServant

"Buildup" is either algae caused by an imbalance or these 3; beneficial bacteria, detritus or aufwuchs, a mixture of algae and microorganisms, all of which is beneficial, even algae to an extent :)
 

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