okay so i just bought and picked up a Tetra Tec EX1200, 300w Hydor Ext heater, Tetra Tec ASP 300 air pump and a Vectron 300 for £90 was this a gd find all kit is used but in flu working order apparently
My questions are because all this kit is used
1) my ASP 300 Air pump as i am a newbie i have no idea what it is used for, is it needed, and because i only got nothing with it only the unit what do i need to get this running?
2) the Vecton 300, it works i know what it dose but because its used can i clean it i shall admit it looks gd and clean but when i opened the Tetra Tec Ex1200 OMG i looked like someone had just picked all over the insides allot of cleaning in that one, but is it safe to open up the Vectron, or is there an easy way to clean or is it best not to bother?
3) just a general note on cleaning, do anyone clean there pipes or is it worth doing i noticed the other day my pipes where yellow/orange colour, and a piece of this yellow orange stuff started cracking of inside of pipe and went into tank
, as my pipe is over 54" in length is it worth it and whats the best way to clean the pipe flushing with hot water dosnt work, well for me 
all help and advice much appreciated thnx

My questions are because all this kit is used
1) my ASP 300 Air pump as i am a newbie i have no idea what it is used for, is it needed, and because i only got nothing with it only the unit what do i need to get this running?
2) the Vecton 300, it works i know what it dose but because its used can i clean it i shall admit it looks gd and clean but when i opened the Tetra Tec Ex1200 OMG i looked like someone had just picked all over the insides allot of cleaning in that one, but is it safe to open up the Vectron, or is there an easy way to clean or is it best not to bother?
3) just a general note on cleaning, do anyone clean there pipes or is it worth doing i noticed the other day my pipes where yellow/orange colour, and a piece of this yellow orange stuff started cracking of inside of pipe and went into tank
all help and advice much appreciated thnx