Crystal Black Shrimp
Caridina cantonensis var. 'Crystal Black'
Min Tank Size
30L
Adult Size
2.5 cm
Lifespan
2 years
School Size
6+
About
Crystal Black Shrimp are actually the original form of the crystal shrimp line, predating the red variant that most people are more familiar with. Native to southern China, specifically the Pearl River drainage, they were selectively developed by Japanese breeders in the 1990s into the striking black and white banded shrimp you see today. The patterning ranges from mostly black with thin white bands at the lowest grades all the way up to dense, clean white coverage with crisp black sections in the higher SS and SSS grades. Mixed colonies with Crystal Reds look genuinely stunning in a well-planted setup.
These shrimp need soft, acidic water to thrive. We're talking pH between 5.8 and 6.8, GH of 3 to 6, and KH as close to zero as you can get. Most tap water is completely wrong for them, so RO water remineralized with a Caridina-specific mineral supplement is the standard approach. Temperature should stay between 20 and 24 Celsius. Push past 25 and you'll start seeing stress, failed molts, and deaths.
Diet is easy enough. They graze on biofilm and algae constantly, but you'll want to supplement with quality shrimp foods, blanched vegetables, and occasional protein. Overfeeding is a bigger risk than underfeeding with these guys.
They're completely peaceful and won't bother anything. The challenge isn't behavior, it's keeping the water chemistry stable enough that they actually survive and breed. New hobbyists underestimate how unforgiving they are. Get the parameters dialed in, keep a mature tank with steady readings, and they'll reward you with healthy offspring and one of the most striking color combinations in the freshwater hobby.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Keeping multiple Crystal Black Shrimp together
Best kept in a species-only or dedicated Caridina tank; mixed communities stress shrimp and reduce breeding success.
Compatibility
Crystal Black Shrimp should really only be kept with other Caridina species that share their exact water requirements, or left in a species-only tank. They mix beautifully with Crystal Red Shrimp, though note that the two can interbreed and mixed grades or line-crossed offspring are common. Very small, peaceful nano fish like chili rasboras or ember tetras can work in larger tanks, but even these carry some predation risk for juveniles and berried females. Avoid any fish that is remotely curious or nippy. No cichlids, bettas, gouramis, or anything larger than about 3 cm. Most hobbyists find a dedicated shrimp-only tank gives the best breeding results and least stress.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The biggest beginner mistake is trying to keep these in untreated tap water or a tank that hasn't fully cycled and stabilized. They need RO water remineralized to precise targets, and a tank that's been running for at least a couple of months. Parameter swings kill them fast. Copper is absolutely lethal, so check every fertilizer and medication before it goes near the tank. Acclimation needs to be slow, drip-style over at least an hour. Don't skip this. Molting problems are usually traced back to incorrect GH or KH, so nail those numbers first before troubleshooting anything else.
Behavior & Aggression
Crystal Black Shrimp don't have an aggressive bone in their body. Males will chase females during molting periods and there's occasionally some scrambling over food, but nothing that qualifies as real aggression. Dominant shrimp may briefly push smaller ones off a food source, but no injuries occur and it resolves in seconds. The only real concern is stress-induced hiding, which happens when tank conditions deteriorate or they're kept with boisterous fish. A shrimp that never comes out is usually a sign of poor water quality or incompatible tankmates, not aggression within the colony.
Things to Know
- Extremely sensitive to water parameter swings, acclimate very slowly
- Requires RO or soft source water, tap water usually unsuitable
- Copper in any form is lethal, check all fertilizers and medications
- Grade affects price but not care requirements
- Can interbreed with CRS, keep separate if preserving line purity
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