the first one is..i am currently about to drill a hole in the bottom of my tank to i can drain out water.should i drain more than one hole? i am thinking about using a petcock or some type of valve to turn on and drain and close when i dont want to drain. what type should i use and where can i get it?am i on the right track or should somethiing else be used to keep the drain hole/holes closed? my second question is in regards to the material keeping the substrate from falling into the false bottom.i have decided(unless you guys think its a bad idea) that i am going to make a simple false bottom using gravel.i am going to layer the gravel as high as i want the water layer,then place a screen of some sort on top of the gravel,then the substrate.although simple,will it still work? i want to make a false bottom that still looks nice and real.anyway,my question is in regards to what material to use.can regualr window screen work?will it rust? i dont want to use a material that is too fine and restricts/slows down the water exchange too much,because i am going to have a pretty fast falling water fall and i dont want the tank to flood due to the water falling faster than it can filter through the substrate.any suggestions on a decent material that wont clog or rust any time soon.oh yea,just one more thought.if i decide to add a fairly large water area,and i need a filter,is an actual filter really needed.what i mean is,cant you use filter like layers in your false bottom ,so that when the water seeps back to the bottom,it is filtered in the process?thanks!

