I also asking myself and others about this very long time ago... what supplement need to be added to my tank? Even tho i just needed to ask myself and do some reading ... the answer will be always regular water change will be enough... no matter how big your tank is!

So do i really need to dose this and that? first of all the question i need to ask myself .. why i need to dose that and what is my current parameter? after that ... do i really need to? maybe the best answer is "don't fix something which already ok"

Until now I rarely using KH buffer.. the only reason before was because KH parameter was down to 6... again the advice to myself is always dose something that i can measure.

How bout the liquid food? I was using this once .. and the result is Aiptasia! for me its not worth of money and time! even tho its not the only reason for that... but its happen after i introduce that liquid food. So from this i think i was wasting money to create a better place for the pest and wasting more money to get rid of it .. so i just like double stupid in there =D

so in short.. regular water change is enough.. unless i have high requirement coral.. which i doubt so!