Tips easy clan credits and crystal of life

This is tips for low level who has just started pocket summoner game. Clan credits are needed for buying decents guard in PS. Crystal of life is used to empower guard in order to obtain more bonus stats and certain skill.
The question is, how to get those easily?
Ok, I will let you know. Most of top clan member are crazy in fighting another clan. based on my experience, they always attack another top clan. It's rare that top clan attack low level clan.
Thus, if you want to get easy clan credits, just attack the top clan, IMO most of broken clan are starting from 20th from the top. So if you are low level in PS, but need clan credits, this is the easy way.
By doing so, you also have a big chance to get crystal of life.