how many fish can i keep in a 20gallons tank? - The Reef Tank





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Old 03-24-2002, 01:34 AM   #1
cc23k
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how many fish can i keep in a 20gallons tank?

wat's the maximum amount of fish i can keep in a 20 gallon tank?
i wish to keep 1 marron clown, 1 blue damsel, 1 drawf angel and 1 cleaner shrimp. does that sounds fine, or overcrowded?

btw, is it possible to keep tang in a 20 gallon tank?
1 marron clown, 1 yellow tang and 1 cleaner shrimp. sound alright??

i've 1 marron clown at the moment. been keeping it for a month, and it's doing fine.


thanks.

my specs... 20gallons tank, using a eheim pro 2222 stuff with cotton to trap waste, running to a wet/dry filter.
no DSB and LR.
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Old 03-24-2002, 02:27 AM   #2
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2 fish the size of small ocellarus clowns will be a safe max in a 20g tank. The Maroon grows to 6" and is too big if it survives. At best 2-3 smaller gobies or similar would be OK, but a 20g tank isn't big enough for a tang, no matter how small and cute. They need space and stress easily making them prone to disease. With the filtration setup you are using, be prepared to do weekly water changes
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Old 03-24-2002, 07:00 AM   #3
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I concur with Doug. Maroons and Yellow tangs are just too large, and the tang needs a larger territory than you can give him.

There are lots of suitable specimens for smaller tanks, many gobies, cardinals, pseudochromis (add one last it's a bully), chromis (I'd go with chromis instead of damsel.....damsels are troublemakers!), dwarf angels, some of the smaller wrasses...

Pick 3 or 4 fish that are suitable, research what you want, and what will "get along" and go with that.

Doug's also right about the filtration....that cannister will harbour nitates if you don't keep up with changing the floss. You might want to run some carbon in it too, occasionally, or put a bag of carbon in your wet/dry occasionally. Do you have a skimmer? A skimmer will help you maintain water quality too.

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Old 03-24-2002, 07:16 AM   #4
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Just a heads up CC,

I have a 38g and trust me you do not want to put any large fish in it. I put a butterfly and angel in my tank. They seemed to be doing good after about a month then for no reason disease and death. All other tank inhabitants are doing good. I have a clown in my tank and he is growing fast, I don't want to let him go if he gets to big but if I must . I have a firefish and royal gramma and they are very nice to the eye to watch. I use a canister filter so be ready to do monthly if not every 3 week change of pad and carbon packs. Not sure about the whole nitrate factory thing so don't want to chance it so I change pads and carbons regularly. HTH
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Old 03-24-2002, 09:06 AM   #5
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Hi there! My wife has a 20 gallon mini-reef aquarium and contains 5 fish. She has a pair of black and white clowns, 2 gobies and a magneta dottyback which went in last!
Her tank is doing great and has been up and running for over 2 years. She really babies this tank and very faithful on water changes as well. Johnny
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Old 03-24-2002, 10:16 AM   #6
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In our old 20g reef we had 2 firefish and 2 percula clowns. 4 small fish will max out a 20g. The maroon clown does have the potential to grow large and mean. Definately wait to get a tang until you have a larger tank.

Adding a pound of live rock per gallon of tank should be plenty to provide filtration in a 20g...even without a deep sand bed. I'd ditch the canister filter, unless you are prepared to clean it quite frequently. The debris trapped inside can become a nutrient sink, raising your nitrates.

HTH-
Brooke
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Old 03-24-2002, 08:28 PM   #7
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ok, i guess i wont be able to keep many fishes in the tank i have.

but i really do not wish to give up on my marron clown.

how bout adding just a flame angel to my collection?

is a cleaner shrimp necessary for the flame angel?
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Old 10-02-2016, 06:17 PM   #8
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Hey guys, i KNOW this is old. But I'm planning a 20 gallon tall cube. I was just wondering if these fish would be too much? I was planning 1-2 small clowns, an exquisite firefish, a pom pom crab, a shrimp and a fire angel. Ill have a 5g sump with a refugium in one of the chambers for filtration as well as keeping a copapod population
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Old 10-02-2016, 06:53 PM   #9
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Hi Ambrosius, your own thread would be better to address this, but no a flame angel wouldn't do well in a 20g tank. Neither will a mandarin. He would decimate the population of pods in that size tank in no time and a small section of a 5g sump won't provide enough breeding pods to help. If you wanted to keep a mandarin in that tank you'd have to set up a feeder and hatch baby brine shrimp daily.
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Old 10-02-2016, 07:41 PM   #10
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I agree with chi. I would stick to the one to two small clowns and maybe a firefish. Is it possible to get a larger tank or no? This hobby is addictive and almost always you will want to go bigger after you get this one set up. There will always be that one fish you can't have because of a tank too small
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Old 10-02-2016, 07:43 PM   #11
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Oh and Pom Pom crabs are cool...sorta. I bought mine a year and a half ago and have only seen it a hand full of times. I personally wouldn't waste the money on them. They are a night scavenger. You could go with a emerald crab. They stay out a little more
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Old 10-03-2016, 03:44 PM   #12
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Do you have room or money to purchase a larger tank like a 40B? That would open your options fish wise and wouldn't be too expensive to upgrade to from a 20G. Especially if you get a petco $1 per gallon sale tank.
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Old 10-03-2016, 04:00 PM   #13
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Typical sardines can is 3.75 oz and about dozen sardines fit in. So a 20 gallons tank, with about 25% occupied by live rock should hold 12*20*128/3.75*0.75 = 6000 sardines.

Just kidding.

Last edited by igvm; 10-04-2016 at 10:29 AM..
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Old 10-03-2016, 05:14 PM   #14
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Lol ^
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Old 10-04-2016, 02:17 PM   #15
Ambrosius Malachai
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i cant really go that big. Firstly, i want a cube tank. I dont like the rectangles, and i have a specific set up in mind for the rocks and coral. My apartment sets max size you can own is 40g TOTAL. Meaning any tanks you have can not add up to over 40g, this includes the sump. Its hard to find a cube tank, even a tall cube thats between 20-30 gallons. That way i could have a 10 gallon sump
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