Black Ghost Knife Brackish???

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Squirt0170

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May 16, 2006
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I was told by a Petsmart employee that Black Ghost knifes are Brackish fish but another told me he would be fine in my aquarium... I'm not really even sure what "brackish" fish water is (So I'm reading the FAQ for newbies on that subject)

Now the one I bought has being doing just fine in my freshwater aquarium... I do add Aquarium salt but NO sea Salt....

I LOVE this fish and want to keep him alive as LONG as possible... Any help would be great!!
 

mrgrudge

AC Members
Apr 7, 2006
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You are aware that they grow to be 20", right? How big of a tank are you keeping him in?

I've wanted one of these adorable fish but I just don't have a tank big enough to keep one in myself.
 

dorkfish

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Jul 25, 2005
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aquarium salt is no good for brackish fish, you need to use marine mix. That being said black gohst knifes are completly fresh and acording o petsmart all fish do better with aquarium salt, well, the truth is it shortens thier lifespan.
 
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Squirt0170

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May 16, 2006
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Big Tank Indeed

Oh yeah I know they get big.. I seen a HUGE clown knife at a LFS and he was amazing looking!!!

Right now he is in a 30 gal because he's still tiny. Then in about a month he's going to my new 75 gal. it's still cycling.

Thank you for letting me know they are NOT brackish fish.. I was not aware that aquarium salt isn't good for them. I wonder why they sell it?
 

FreddytheFish

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Aug 29, 2005
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Cincinnati, OH
I was told by a Petsmart employee that Black Ghost knifes are Brackish fish but another told me he would be fine in my aquarium... I'm not really even sure what "brackish" fish water is (So I'm reading the FAQ for newbies on that subject)

Now the one I bought has being doing just fine in my freshwater aquarium... I do add Aquarium salt but NO sea Salt....

I LOVE this fish and want to keep him alive as LONG as possible... Any help would be great!!
Bullcrap. They don't need brackish water, keep him in fresh.
 

monkey_toes

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Feb 7, 2006
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Ghost_knife

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Nov 17, 2005
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please dont put your ghost in a brakish, I have about 4 of these lovely fish and they cannot live in those situations. Each of them is in a 400 Gallon aquarium one being in 1100 gallons
 

Kennyb

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Apr 25, 2020
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Ok guys I most recently have a discus fish who developed pop eye so I did a 50% water change and added some prime and a little algae fix and some API aquarium salt and now my black ghost knife is struggling swimming sideways and floating a bit and breathing erratic and not eating is it the aquarium salt? I have 3 discus 1 Bgk 2 silver dollar tiger 2 red Severums and a 1motoro stingray in a 220g and have never had this problem because I usually keep good water quality I’m confused my water temp is currently at 83.8 I usually keep it at around 80/82 but I bump it up a little to settle the discus with the popped eye any suggestions please help???
 

dudley

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Feb 9, 2005
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Kennyb, why did you add algae fix to treat pop eye? I suggest performing another water change to remove at least some of the algae fix.

What are your test results for ammonia, nitrite, nitrate and pH?

How often do you change the water and how much do you change when you do?
 
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