iv got a sand based substrate in my 120L tank, i clean it using a gravel cleaner, sand looks awesome as my corys also help me out! im just wondering what methods people use to clean there sand based tanks? also i used to have shrimp in my tank, but they poop so much and it looks horrible on sand as ur constantly cleaning it. has anyone else had this problem? or is it just me lol. and advice please! tah.