discus sudden death?

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mother monster

Feeder Fish
MFK Member
Oct 28, 2010
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Atlanta/Tampa
Has anyone experienced any sudden death of their apparently very healthy discus?

I bought two very healthy discus yesterday from an offbeat petstore. My water parameters&temperature are perfect for discus, and I'm very frequent&thorough with all types of water testing and am confident in my established 3 year old heavily planted 55gal and it's stability- but for personal satisfaction I test the water daily. Both discus were healthy and eating bloodworms vigorously last night right from my hand&swimming around after a 50% water change. For the rest of the night, no problems.
The next morning, I turn on the light to find one discus recently dead, and the other hanging around at the top.
This action is not necessarily panting, but has his face and mouth trained upwards, almost boredly drifting and bobbing gently, which didn't cause me panic previously since they're new additions in an unfamiliar tank. I noticed both discus doing this last night after lights-out.

Because I bought both discus yesterday, is there a chance that it was simply too much a shock for one of them? Maybe they require an intensely long acclimation process? I figured after letting the bag warm up in the tank water for an hour, I'd introduce it little by little into the bag- but I might should have taken even longer on that, or tried a different technique. Perhaps he was older, or perhaps the same fate awaits the remaining discus.

Maybe there's something I'm missing? A parameter I need to keep the closest eye on aside pH? I'm experienced, but discus are new territory. Do they prefer temperatures even warmer than 86 moreso? Is it simply true that discus thrive best in an aquarium where there are very, very few other fish to none at all and almost 'can't' be kept in a varied-species tank? Or if this is possible, must the bioload be very small? They were in a community tank with a small group of clown loaches, 2 mollies, a few ghost catfish.

As a side note, the same day the discus were purchased, from the same store I also purchased a hillstream loach and several small clown loaches. The hillstream and a small clown loach were also found dead this morning; so obviously I feel this could perhaps have been a factor; I suppose no pet store is perfect. Deaths are a strange occurrence in this tank- I'm a crazy-obsessive fish-mommy so I haven't had a death in any of my tanks in forever- but honestly as an avid aquarist always looking to become more skilled, I'd really love some input on the discus death. Always sucks a lot to turn on your light and see 25 bucks laying dead on the substrate- no 14-day guarantee from Pet Wize.
We all realize part of the hobby is sometimes fish die without explanation, for a lot of reasons. It still doesn't stop you from wanting to know why! And how to fix it or stop it from happening again! With conditions even better than they were at the kinda poopy store I got them from, they were very happy in my tank, elated to be able to move. Discus appear to be incredibly fascinating and interactive, so any help on saving my little buddy would be appreciated. I'm a little wary that he's going to pass away simply because his buddy died- in anyone's experience are your discus happier single, or in a nice-sized group?

I probably won't attempt discus again in a community tank, unless I hear some success stories soon, haha. Or am able to fix the error I made, if I did. They're so beautiful, even if they are a lot of attentive work. And final quick questions- how do you get your discus? From a pet store, online, or a breeder? I suppose it's a good thing they're so expensive, since they're apparently their finicky reputation lives and dies with them. Going to do another wc in a bit here. I have no ideas and hope very much someone can help out. Thanks for your time guys!<3 :character0004:
 
Also, I tested the water this morning out of curiosity after the deaths, and it's exactly the same as last night, ideal conditions with no change whatever. The other discus is dazedly bobbing at the surface, I wish there was something I could do!
 
50% water change on a 55 gal might be too much for discus. I only do 25% at a time for my 60 gal discus tank and make sure I put in an air stone so they won't suffocate from the water change. It is better to do frequent small changes than to do large change at one time ESP with sensitive fishes like discus.
 
I am sorry for your loss. IMO and not an expert, there are so many reasons for sudden death. I bought other fish from LFS but not discus. I read a lot of warnings about LFS discus and have gone to very much every store around my area. I agree, MOST (not all) LFS don't have healthy discus so i bought all mine online. For new fish, i usually add tank water little by little depends on how many fish, i add a cup of tank water every 10-15 mins and repeat 3 times minimum so they can get use to your water temp, ph.... what you did they can get PH shock because your LFS' PH may be different then yours.

monther monster said:
Also, I tested the water this morning out of curiosity after the deaths, and it's exactly the same as last night, ideal conditions with no change whatever. The other discus is dazedly bobbing at the surface, I wish there was something I could do!
i would add an airstone in the tank. if you already had 1, add some more.
 
What's your favorite website for discus? Or do you use classifieds? And thanks for the tip on introduction! I was a little brusque going about that. As for the airstone, do they need that extra boost of aeration or oxygen? I figured such a heavily planted/well-lit tank would be fine as far as that goes, but I've got several airstones lying around, it's worth a try! Thanks!
 
I actually performed the water change before I introduced the fish, but I'd forgotten about that issue- incidentally lost my farlowella catfish that way, too big a water change. How often do you perform the changes on your 65? Wasn't aware of that particular sensitivity for discus either [though I should have, jeez], thank you very much!
 
I do 25% every 4-5 days some times I laps but never more than a week.

When I have new discus I crank the temp up to 86 and use air stone for a week to make sure all are good with the new fishes then turn it down back to 82 degrees.
 
When adding any med or chemical to your tank be sure to air stone. High temp equal less oxygen in the water and those darn discus love warm water lol
 
So sorry to hear of your loss/problems. Try posting in the disease/sickness part of the SimplyDiscus.com forum. Be sure to fill out the questionnaire in the sticky before posting.

What size were the discus you purchased? Since you added them so quickly (no quarantine), the true cause could be a variety of things. With the suddenness, I would suspect something to do with water, heat, or oxygen. A disease/parasite would take a few more days, and even then you would notice signs. Did you test the water from the LFS and compared to yours?

Discus are happiest in groups, 6 or better. Most serious discus keepers buy there fish from reputable importers or breeders, like Discus Hans or Kenny's Discus. They are actually not as fragile as people make them seem, they just need a suitable, stable home and good diet.
 
how do you do WC? do you age water? 'cause PH from tap water may be different than your tank water. I age my water at least 24hrs. I agree with nikonian about frequent small WC, this way your ph and temp won't change that much. go to check out simplydiscus.com, they have ton of info.
 
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