i wouldnt run zeo IF you are not experienced in maintenance esp in the area of tight parameter control and in the regular habit of testing for it.
this system is not for everyone nor was it meant to be for everyone...it is for those who absolutely love and enjoy putting time into their reef. it is no different than some of my friends that rush home from work to fix their cars, polish their cars, look at their cars...etc...for hours and hours and hours..........and hours...
if one is looking for an 'easy' way to get popping colors...then zeo might be a challenge for those. it requires measured daily dosing, daily zeolite rock movement and weekly (triweekly for me when i was going full bore) testing of critical parameters of alk and ca...along with the odd mg and the K+ that seems to be lower in zeo systems.
i have gone on holidays and have experienced no problems...but i did this when i was deep into phase II of zeo...so missing a few days was no big deal. and...going on vacation with zeo is no different for me than going without zeo. with my tank caretaker...i leave a 12 page detailed print out of what to do but more importantly what to look for if and when something goes wrong. then they are to call me promptly. i do not let them feed or dose anything. i wouldnt even let a fellow reefer dose my tank...even if it were non-zeo. there are things that only you will know about by the subtle nuances that your system tells you. i just ask them to make sure the lights go on, water is moving, the temp isnt too high and to check salinity...and to add fw from a dedicated rodi spout in a premeasured amount. no auto top off for me.
the learning curve is steep and the dosing seems initially confusing...and heck, it is in the beginning...that is what the mods on zeo are for.
as for lfs' doing zeo...it is somewhat scary for me if they are having inexperienced hands dosing the additives...esp if there is no set schedule, no set responsibility etc. see the potential for a problem that can easily lead to a crash? lfs' owners have a tough enough time worrying about operating overhead, thinking about profit/loss margins, when the next shipment of live goods are coming in, when the next shipment of drygoods are coming in, if this shipment of livegoods is going to be seized because of inadequate CITES documentation from the shipper, cleaning the tanks, uprighting corals, water changes, feeding the fish and the most time consuming part...trying to catch THAT nemo fish for the 8 year old that insists on having THAT one. another easy pitfall for zeo use in a lfs...distraction.
cost:
initial cost 'can' be expensive. but heck, what isnt in this hobby? in reality, the most expensive part of zeo is the 'reactor'...and i made my own 2 gallon external reactor for $20 (rather than the $450+ it would normally cost). believe it or not, zeo has decreased its prices. i used it when it WAS expensive. they have cut their original prices by 10 - 20%. to start, you just need the basic four: zeobac, zeostart2, zeofood, zeolites...and they are not 'that' expensive.
if and when you are ready to start zeo, go on the forum and ask as many questions you can and want to...the guys on there are a ton of help with infinite patience. i know, they helped me through it!!!
