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  #1  
Old 21-03-13, 00:35
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Unhappy Ghost Knife Fish

Hi all
I have kept black ghost knife fish forabout 4 years now. I had two lovely adults about 20-25cm long, until my cat decided was going to go fishing a few years back.
Now I have one adult and I had bought a baby one about a 2 months ago. It was going really well, happy and feeding well.
I did a 50% water change last night, after I noticed he seemed quite stressed but the big one was acting the same. I found the baby dead this morning, but the adult was fine.
did I do too big a water change for the baby? does anyone know much about BGNF??
Any input would be greats thanks
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Old 21-03-13, 01:19
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sorry for your loss. was this the first big water change you did ? maybe shock caused the death, but that fast astounds me jk
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Old 21-03-13, 01:34
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I usually do smaller water changes more often but I was abit sick so was about 2 weeks between last change and the plecos had made a hell of a mess with some zuchini.. he was happy before I did the change he was eating the blood worms from top of tank (he used to follow my hand for them) and everything. then noticed after the change was laying down like stressed. my big fellow was doing the same thing. he came good but little fella didn't.
I can only think I stressed him out with the water change??
all the other fish plecos mainly, are happy as and look good..

Sorry no it wasn't the first big water change I did with him in the tank, about a week or so after I got him a did a big one too. just waiting for my other tank to be ready then gunna switch over some plecos. they are in a 4 foot tank atm, but I wanna let the tank run for a week or so before switching, I don't wanna lose any of my plecos

Last edited by McTackett; 21-03-13 at 01:38.
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Old 21-03-13, 01:38
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maybe reduce the water changes to 20% every 3days.
I do not know how long you leave the vegies in your tank, but I would leave them for only 12hours and then remove, otherwise they will make a hell of a mess. again sorry for your loss, but i think the large water change, especially after 2 weeks stressed out the little fella. cheers jk
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  #5  
Old 21-03-13, 01:41
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thanks that was what I thought but just wanted to double check. I will keep on top of it now. and I left it in over night but they love it and ate prettty much all of it.
I hurt my back so was travelling between docs which was why so long between water changes.. poor fellow
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Old 21-03-13, 16:50
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Was there a big change in water temp when you did the water change?

A mate of mine did a big water change and the temp dropped below 20 and the black knife went mental. He put it in another tank and it was ok again.
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Old 22-03-13, 00:14
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I didn't look at the thermo, to check but I think it would have been maybe a degree or two cooler. I could check what comes out of the tap but I think so.. Pity tho. the adult is all good. babies dont seem as tough.. he was about 6.5cm long. Didn't think of that.
I need to go away in a few weeks time when i get back, would it be better to do a couple of small changes over a couple of days then a big one??
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Old 22-03-13, 04:05
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I was thinking the ph too, as I have a 20g that the ph drops without my knowledge, as I don't do daily wc's in that tank . I find it is safer to test the ph if it has been a while , then try to match the ph by lowering it with buffer down, until I can get back to normal ,doing every-3-day wc's . Then it pretty much stays stable. When it becomes my q-tank, I will do wc's daily .

Years ago , I lost some harlequin raspbora in the 20g after doing a wc, due to my tap being 7.9, and of course it had dropped in the tank .They flipped over right in front of me. Now I test first if it has been a while.

sorry to hear of your loss. perhaps testing ph could help next time to prevent shock. just a thought from my experience.

I would do small wc's daily to play it safe, but see what others say. If your tap ph and temp match the tank at the time of wc, a larger wc might be ok,but I am personally uncomfortable doing large ones myself.
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Old 22-03-13, 04:14
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oh, question, is someone experienced gonna keep an eye on the tanks and feeding while you are gone ? Good to have someone keeping an eye on everything, filters too, in case of a power outtage.
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Old 22-03-13, 04:58
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i don't think she has had fish before but I was going to give her a crash course in looking after them. Just going to show her how to get the filter up and running if it has any problems and how to clear it etc. hopefully won't have any eggs or anything in the tank when I have to go.. the BN that I'm tryin to breed will be in a four foot tank with two baby gold spot plecos, Just got a 5foot tank and going to switch some of the fish around..
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