[scrapedogg]

Do I need one of those, or can I get by with two emperor 400's? I always hear about sumps and wet/dry and overflow boxes etc. What the hell is all of it? I don't want to kill my fish, so if I need all of this crap, I'd like some help in discerning what it is, and if I can make it on my own

 

[SnowCichlid]

It is just another type of a filtration unit
if you go to the tutorial section there are some ways in which to explain this to you in details
also how to build one :smile:

 

[Xenon]

A wet dry is a type of filatration unit touted by many to be the "best". This does not make it mandatory. Check out the glossary link above for definitions to sump, wet dry, etc, etc.