I have a 5ft 100g tank with 2 oscars, 1 pleco,1 sinadontis, 1 electric yellow, 1 lump head, 1 clown loach and 1 ghost knife. i did a 25% water change/gravel clean 2 days ago and this morning i notice that there is alot of solid waste especially from the pleco that just sit on the bottom and when the sinadontis flicks his tail it stirs it all up. It's as if I haven't cleaned the bottow for a while. Is this normal???
I'm running a pH 6.5-7.5, nitrates round 10ppm, ammonia 0 everything looks cool apart from when the bottom feeders stirup the gravel.

sometimes the set up or positioning of the suction point and
discharge point of filtering pump plays the important role. the
location of the two points should create current so that the
solid waste will be driven toward the suction so that it will
be removed accordingly.