Wow!!! Thanks for the replies!!!
hmmmm... i would really not prefer to increase my expense... isnt there any DIY or less expensive way to create a random or alternating flow?...
my bday is coming up this October and i hope a friend decides to finalize our agreement that she contact me regarding the pricing of her aquarium and stand xD then will i start my "darkside" journey HAHA
by the way... thanks again Mytee for the pic... im a visual type of guy and i usually prefer to know by looking xD your pict helped a lot!!! still... i gotta watchout for my expenses since i am not earning tons (yet) xD