What is a protein skimmer?

Should I add one to my 30g?
What kind of filtration do you already have? As others have said, skimmers help with gas exchange (oxygenation) as well as removing organics. If you have a HOB filter that's providing surface agitation you will probably be fine without a skimmer for gas exchange, but depending on your bioload and the needs of your specific coral, it's possible a skimmer would help.
 
What kind of filtration do you already have? As others have said, skimmers help with gas exchange (oxygenation) as well as removing organics. If you have a HOB filter that's providing surface agitation you will probably be fine without a skimmer for gas exchange, but depending on your bioload and the needs of your specific coral, it's possible a skimmer would help.
I am not adding one
I am not exactly sure what my filter is though
 
Not a necessary piece of equipment at all, especially in a 30 gallon aquarium. You could add one which will help with pH and o2 exchange as well as removing some dissolved organics, but I would recommend you only do that if you have a sump as they are a bit of an eyesore and more finicky if they are hang on back (hob)
I always thought you needed one. I have a 45g but with a lot of coral.
 
I always thought you needed one. I have a 45g but with a lot of coral.
You don't NEED any specific pieces of equipment, they just make it easier to achieve the water quality (including temp) you want to have.
 
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What stony corals are in there?
Mostly LPS, frogspawn, hammer, trumpets, Duncan's and acans. I have 2 SPS, a birdsnests and a lepto. Pretty much everything else are softies.
 
I always thought you needed one. I have a 45g but with a lot of coral.
100% not a necessary piece of equipment regardless of amount of coral. Maybe if you cant get the nutrients down through water changes, carbon dosing, gfo, or refugium, etc. The only necessary time might be if you are running a tank with a sealed lid but then you are using it mainly for O2 exchange
 
I added
2 gogorians
A Zoanthid
A hammer
A green star
Frogspawn
2 birdsnest
A lepto
A cabbage leather
A duncan
A Candy cane
A trumpet

from those corals do you think I need a protein skimmer?
 
I added
2 gogorians
A Zoanthid
A hammer
A green star
Frogspawn
2 birdsnest
A lepto
A cabbage leather
A duncan
A Candy cane
A trumpet

from those corals do you think I need a protein skimmer?
You're still missing the point.
 
I have a skimmer on my 22g with a 10g sump. I love it and wouldn’t run my tank without it because I heavy feed my fish and corals and everything loves how heavy it’s fed. With what I see my skimmer take out and what that stuff smells like. I absolutely can’t take any argument against skimmers seriously on anything 10g and above. Some AIO and smaller sump less tanks the skimmers don’t fit and the small nano ones are booty and essentially a gimmick

I also do a 5g water change once a week. After every feeding I also crank up my MP10 on nutrient transport mode and run it for about 2 hours

nitrates stay solidly consistent at 10 and phosphates stay at around .10 recently.
 
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This is my tank without a protein skimmer. I have green star, hammer, frogspawn, candy cane, palys, leathers, gorgs, BTA, bird's-nest and even a lepto. My tank does have macroalgae for nutrient uptake. The macros take up dissolved organics the same as a skimmer and I like the looks of them.
IMG_20230402_164456435.jpg
Nice tank!
 

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