The sponge to catch stuff
The carbon to polish the water. (As long as you want the water polished that it)
Ammo-rid to help lower ammonia levels. (Alright for an emergency, But shouldnt you really just do a water change or figure out whats causing the problem.)
Zeo-carb is 1/2 & 1/2 of carbon and ammo rid.
Theres nothing wrong with haveing all on hand, But i wouldnt run them all at same time. I myself run a sponge on my fresh tank's and will only use the others if there is a need.
__________________
______________
Tim
|