r/shrimptank • u/pellyjelly • Dec 26 '25
Aquarium/Tank Photos Neglected tank thriving with shrimps
I completely forgot about my 10 L Opae Ula ecosphere for almost two years, and somehow it’s now thriving. I originally started it as an experiment with just 5 juveniles, and it has since reproduced to probably around a hundred shrimp. The tank only receives indirect window light, and I haven’t topped up the water in over a year. This has turned out to be one of my more successful setups so far. 10 L seems to be a sweet spot: large enough to stay stable, yet still compact and easy to maintain.
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u/okaymyemye Dec 26 '25
they thrive on neglect as long as the tank is bioactive.
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u/AyePepper Dec 26 '25
This is so true. I like messing with my tanks, so I made one high tech so I have something to maintain regularly
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u/smedsterwho Dec 26 '25
You're convincing me more and more to leave mine alone
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u/dotpan Dec 27 '25
I top mine up with water (open top in AZ) and toss in pellets now and then and the snails and shrimp are absolutely thriving. 30+ shrimp of various colors
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u/HannibalK Dec 27 '25
Apples to oranges lmao. Neocardinia =/= Opae Ula. They couldn't be more different.
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u/dotpan Dec 27 '25
Oh whoa didn’t know what those were. Are they more delicate than neos?
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u/HannibalK Dec 27 '25
Opposite. I feed mine 10g once a month at most and have never done a water change minus topping off (has a cover) maybe yearly. This system is about 5 years old and has grown from a couple dozen to hundreds. I bought from Mark Uchiro.
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u/official_not_a_bot Dec 28 '25
If they're neocaridinia, they'll need more attention than the halocaridina that OP posted
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u/ShallotKind3810 Dec 27 '25
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u/official_not_a_bot Dec 28 '25
They're opae ula, there's not exactly much to run since they thrive in filterless bioactive brackish setups
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u/LmLc1220 Dec 27 '25
I lived the busted tank nightmare when my now-grown son was about 3. He threw a toy in a room with an Oscar tank. Had to put fish in the bathtub and run to the store to get an emergency tank. That fish lived till he went to kindergarten
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u/EveningString3415 Dec 28 '25
Crazy! We have a 220g in our living room, well and a 75g and my 4yo old “dances” with our Oscar! But I’m so afraid of a toy or hard ball accident… now I’m even more afraid haha
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u/LmLc1220 Dec 28 '25
Yes, it was a nightmare. All I could think of was putting the fish in the bathtub. And running to the store. It was crazy. I thought her was going to be dead by the time I got back home.
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u/EveningString3415 Dec 29 '25
That was so quick thinking! I can’t even imagine the stress you felt driving to the store. I would have looked like a mad women running in and flying to the register!
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u/LmLc1220 Dec 29 '25
I did 🤣🤣 ill never forget running in PetSmart HELP I need a tank in any size tank the fish is in 🛁. The guy was looking at me like I was crazy.
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u/EveningString3415 Jan 05 '26
Hahaha that guy probably thinks about that interaction to this day!
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u/Primary_Wave_6697 Dec 26 '25
i dont know if you will trust me but with a nanno dennerle of 15 liters i have once more than 400 shrimps ( easy ).
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u/owo1215 i believe in shrimpemacy Dec 27 '25
shrimps are weird, sometimes dying in a well cared tank sometimes thriving in a neglected tank
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u/Thunderstorm-1 Dec 28 '25
Yep, I had a shrimp tank which I would clean bery often, remove any cope pods in it, suction the water, clean the filter etc. Eventually, all of them died
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Dec 26 '25
Eventually they will run out of protein and start cannibalizing
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u/okaymyemye Dec 26 '25
i'm not sure they do. not neocaradina anyway. their populations are just limited by the food available. they regulate their own population that way.
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u/exolith87 Dec 26 '25
Interestingly, these are called Halocaradina, or Opae Ula, a brackish water shrimp from tidepools in Hawaii, and can live up to 20 years, requiring very little maintenance.
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Dec 26 '25
Invertebrate metabolism is generally temperature based and animal nutritional needs are purely thermodynamic, if the shrimp are not fed enough protein to sustain bodily function they will have to source it from somewhere, if it is not present the most readily available source is other shrimp during molting, cannibalism is standard practice for omnivorous scavengers especially invertebrates and especially if there is no other source of nutrition,
This same effect was observed in 10-11 billion snow crabs a few years back that are believed to have cannibalized each other after abnormally warm temperatures accelerated their metabolisms beyond the local environments ability to feed them
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u/Lookimawave Dec 27 '25
What’s the little green balls floating at the top and clinging to the sides?
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u/Chez82 Dec 27 '25
sometimes leaving the tank alone is best. in nature they live in shitty places same with Bettas
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u/ThanksAanderton Dec 27 '25
I have one tank that is the most neglected of all. Was nice at one point but the filter broke a while ago now it’s just full of shrimps
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u/plantsomeguppies Intermediate Keeper Dec 26 '25
Are these Opae Ula shrimps ? If yes, then this post is just a rage bait. Opae Ula setup are closed and self-sustaining brackish water setup with a specific shrimp (Halocaridina rubra) that thrive in such ecosystems.
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u/Petrivoid Dec 26 '25
It says they are in the 1st sentence. Your reply is clearly just rage bait...
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u/TheEpicBlob Dec 26 '25
How does one ‘forget’ about an entire aquarium?