Reviving a tank

[JustPoprocks]

I recently bought a 32 gallon biocube that’s been neglected for a bit. After moving it across town and I did a 70% water change, changed media and a vacuum of the sand. Yesterday I did another small vacuum of the sand. There is still sooooo much junk just sitting on and in the bed. 1000s of bristle worms (exaggerating Just a tiny bit). There’s also what looks to be a ton of Aiptasia. Currently stocked with 2 clowns(Super inbred), a six line I added yesterday, urchin and small CuC. There is GPS and 5-6 BTAs as well. Reset the scape to give flow all the way around the tank with a MP10. Best way to tackle the sandbed? Is there a CuC that would naturally take care of this? There will be more vacuuming as well. Below is a quick 72 hour time lapse

 

[Rubblereefer]

Just keep up with the gravel vac and water changes, eventually you'll get it where it needs to be.