reefer gladness

Hi Reefer - many thanks for your reply to my plea for some tranquility .
The floto500 skimmer you use - can you tell me if it is easy to install and replace the stock skimmer ? Or do I need to make major tank changes like extra holes etc ?

I've some new hood fans on their way this week ... Woohoo !

Thanks again

Andyt

RSM 130D (bone stock - no mods yet)