I will differ on at least one thing that Johnny says. I think it's a good question that has no implications on whether someone knows what a skimmer does.
I would say that it probably doesn't make a difference if it's just for a few days. You can compensate with an extra water change while you wait for your new pump. Running long term with no skimmer is not common, especially for reef setups. I did it for a small seahorse tank years ago, but I did large water changes every week.
Please explain, if you clearly understand what a skimmer does then you would understand they aren't needed.
I'm running for years without one. It's been over 2 years without one an I'm a full blown Sps dominated 25 gallon nano with over 70 different species including 4 gorgonias that are spot fed everyday. I have no nitrates and no phosphates (nitrate, checked with
salifert , and phosphate with
Hannah checker) I dose to maintain levels and do a 5 gallon water change every two weeks.
Yes, in some situations when a tank is skimmer dependent from over feedings, over stocking then yes you can see negative effects when a protein skimming dependent tanks skimmer is taken offline.
Given HIS situation, a new tank and not dependent on a skimmer it will be fine forever & ever if he chose to go skimmerless.
Trust me I believe skimmers are good for people and people that overstock. But truthfully 90% of the new people skimming have no idea what they even do, just believe they need them, and that's why I posted what they do. Half of the skimmers out there are junk, And it's even funnier when half these people are running skimmers incorrectly.
Half of the people are wet skimming and half of them have no clue how to dial them in causing tremendous salinity changes while pulling out a ton of good nutrients.
Imo, Everything takes time to understand mainly from
First hand experience. I don't know everything but I can definitely vouch that a skimmer is not needed on a reef. I can show you a ton of skimmerless beautiful tanks.
If this was someone with an established heavily stocked tank I would have had a different reply.