Fish dying, could be lack of oxygen?

punkpook

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Nov 10, 2005
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I have a 55 Gal tank with two large filters.

In the tank are various cichlids and others. 5 all together not couting two good sized plecs.

I had a loach in there, pet store gave him to us free because we purchase lots of fish there. Anyway... he had been nipping at my smalled plec which was bigger than him, but after close observation stopped. Also I have a bloody parrot who doesnt tolerate nipping on any fish. he seems to intervene by fighting the fish that bothers the others. Ive never seen him nip the loach though.

Everything was going fine until yesterday when i came home, my loach was on his back on the bottom of the tank and he had whitish fins and gills. Not Ick, looks more like fungus or fin rot. He was still alive but died shortly after. I noticed some of the other fish had the white stuff too, so I went out and bought all the necessary treatments for fungus. I figured the loach was nipping at the others and the bloody parrot probably got him back. I know fungus sometimes appears if they've been fighting. I also checked the ph levels and other tests. Ph was reallly low and the ammonia was high.

My husband who is a newbie aquarist took charge and treated the tank with fungus tablets, ammonia tablets (ammonia was kinda high) and parasite clear. As well as metaflix. I thought that was way too many chemicals at one time and have been keeping an eye on the tank. He also pulled the carbon from the filters and turned one off. He also corrected the ph using the tablets.

This morning I noticed my yellow cichlid (not sure of its name it was also free) was staying on the bottom of the tank and had become lighter colored than usual. So I decided to keep and eye on him. Well about an hour ago, I was making lunch and I looked up and saw one of my barbs swimming upside down and the others were gasping at the top of the tank. I immediatly ran to them and scooped some of the water out (husband had topped the tanks off yesterday) and I took the barb out and put him in my hospital tank and ran him through the water to get his gills working properly (ive done this before, when the time for tank cleaning comes around and hes in a bucket, he jumped out and almost died) Anyway I got him breathing and his color returned , he seems great now.

however, I lost my yellow cichlid. He became white as a ghost. All the whitish spots on the others are gone. I turned the other filter back on, cuz they were gasping and am trying to filter some of the chemicals out.

Is it lack of oxygen or did my husband overload the medications? Ive never lost a fish when i medicated it. I always research the possibilities and treat one thing at a time. He did it all at once. Am I right? or did he do the right thing and we were gonna lose the fish anyway? The ph and ammonia levels,
could have brought it on itself. ( I checked them just last week and all was fine)
Thanks.
 
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Sounds like alot of meds all at once. I understand removing carbon for some meds, but not turning filters off.

Was the loach QT'd before you put him in your tank? If not you may have introduced something then.

What are the ammonia, nitrite, nitrate and pH readings on your tank? On your tap water?

You mention "topping off the tank". Do you do regular weekly water changes? At what per centage?

Okay, for the short term...

Add an airstone. Turning off the one filter has decreased surface agitation and gas exchange.

Turn the other filter back on.

Put the carbon back in to get rid of all the meds until you identify the exact problem.

If you do regular water changes weekly, do a 50% one, now.

If you just top off the tank occasionally, do a 10% one, since you may be in an OTS situation.

How many and what kind of fish remain alive in the tank?

Do you know what kind/size of filters you have?
 
No the Loach was fine before he was introduced to the tank. I had him in another tank with other fish for quite a few months and never had a problem there, he just outgrew that tank.

I no longer have a nitrite and nitrate tester. Ph is reading 7.0 now. It was at 3.0. Ammoinia is at 0.

the tank gets a top off weeky or bi weekly. We usually do a 25 % change bi weekly unless something is amiss. He did a 25% yesterday before treatment.

Filters are on and the carbon has been replaced. Brand new cartridges.

I said 5 fish.. but I forgot to count the barbs & other cichlid. I have 2 barbs, a bloody parrot, a Severum and a cichlid (dont know of the kind) and two plecs.

I have an extra large whisper and a medium whisper. (we just added the med one for more filtration)
 
your pH dropped to 3????? Dear lord thats a SERIOUS drop, and could likely be the cause. When stuff like that happens, bring things back gradually. I'm sure your hubby meant well, but going Rambo on treatments and changing water parameters can be even more deadly then what ails the fish. The best way to keep fish healthy is to keep things consistent.
What does this yellow cichlid look like? My guess would be a Yellow Lab, which if it is, he needs much different water then the others. Labs are african rift lake cichlids, and they need water in the upper limits of the pH scale, 7.8 and above, with 8 or higher prefferable. Since everything else likes nuetral to soft water, i'd remove this fish, at 7.0 pH he's not happy. Dont turn filters off, that can actually lead to a build up of anaerobic (sp?) bacteria, which is a bad thing, and can lead to further deaths. Do lots of water changes for a while to get the water back to normal and get the meds out. Its best not to mix meds, it can overdose if there are common chemicals.
Add more barbs too, they're a schooling fish and like to be in groups of 5-6 or more. They'll also be less nippy when they're in a school, which is a good thing cause the two cichlids you have are not the fleetest of fin.
 
Yeah it dropped to 3, I know drastic! I have never had that happen before. We have 5 different tanks and never has my ph dropped so low. What would make the ph drop like that? There was nothing different going on.

The yellow cichlid passed on, but he was bright yellow with a black spot on his head and three little white spots on his tail fin.

After pulling the medications out and doing a partial, just about 5-10 % change everything looked fine. I left the house on an errand, my husband returned from work about 4 hrs later and called to tell me we had lost the Barbs. :( Both of them. These were the first 2 fish we had. We've had them for 2 years. They were the size of a tetra when we got them. They were tinfoil barbs, no one told us how big there were gonna get. They were 7 inches long. I was so proud of them. Im thankful my bloody parrot survived, he has such a cute personality. And my 7 year old Plec. (handed down from my mom)
 
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