hi ok , well my parents have had a tank for years in our basement but they have never done wc or had the water tested, so i took the tank under my belt about 2 months ago, and discovered that there is all kinds of loose sidment on the bottom with the gravel, no matter how much i vacum i still can't get it out, i had my water tested today and the lfs said i should do a water change every 7 days and to vacum the gravel, is there any better method to clean it faster, i have a 55 gallon tank with the following stock, 1, 5" red belly pacu 1, 2" red belly pacu 1, 5" tinfoil barb, 1, 4 in gorumi 1 6 in pleco and 2 3-4 pictus catfish, my large pacu has no color from the gills up witch alarmed me, btw i have a 180 thats going up here soon, i know the pacu's will get large a indoor pond may be in the works!!