Ok i realise i might sound real inexperienced and dumb right now, but i would just like to know how you guys clean your tanks or do water changes besides the filtration systems. Do you simply just insert a syphon and suck a certain % of water out (30%, 50%,etc) or do you suck water out while you sifting the gravel and take out all the "gunk" ,etc. Or is this a bad thing to do? Lets hear it guys. . .I would love to hear from every1 on the forum but especially those guys with MONSTER tanks, with crystal clear water and theres never ever any "dirt" on the bottom.