So my 45 gallon tank that is planted won't stay clean. The poop shows so much on the sand substrate and there is also stuff floating around. I do water changes weekly and sometimes twice weekly its been running for about 3 weeks and I do vacuum with a vacuum made for a 10 gallon (had for a 10 gallon and have not bought a bigger one) I will vacuum and see poop come through the tube into a bucket I walk outside and dump the bucket walk back in and BOOM MORE FLIPPEN POOP ALL OVER THE PLACE. My tank is not even overstocked! Please Advise!!!