What is wrong with my tank?

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SusieJG

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I hope someone can figure out why my fish are dying off.

Until 2 weeks ago my 40 gallon tank contained 3 platies (2 male, 1 female), 8 guppies (2 male, 3 female, 3 juviniles), 1 betta and two gouramis.

About two weeks ago I came home to find the betta beaten up and one of the male platties sulking on the bottom with his fins slicked back. I moved the betta to a hospital tank and treated him with bettamax. He is doing much better but remains seperated. I also moved the platy to an isolated area of my tank usually used for birthing so I could observe him. After 2 days where he seemed fine other than keeping his fins slicked back, I released him into the main tank. The next day he died. The day after that I found my other male platy dead. I did a 1/3 water change, checked the water stats (fine), added some salt (just in case) and raised the temp (gradually) to 79 degrees (originally at 76, at 78 for 2 days then to 79).

Two days after I did all this I found my female platy dead. The next day I found one of my juv. female guppy with what looked like a red cut on her side. I isolated her and watched carefully. It looked like she was "pooping" from her side instead of from underneath, but other than that she was acting fine. I kept her in insolation for 5 days and although the red thing is still there, it doesn't appear to have changed at all, so I've released her. Meanwhile, while she was in isolation, 4 days after my female platy died one of my male guppies "went missing". I searched thoroughly, moved rocks, etc, couldn't find him. After about 3 days I assumed he had died but still could never find the body, despite extensive searching. I did a tank cleaning and a 1/4 water change just to be safe, even though its a little early. Today (2 days later) I came home to find my other male guppy dead.

I am now left with 2 gourami, 1 betta (recovering in a separate tank) 3 guppy females and 3 guppy juviniles (one still with the mystery red spot on her side). Other than the first platy, none of the fish showed any signs of illness, or any signs of trauma after I recovered the bodies. The last 3 fish I actually examined carefully under a light and gently put pressure on their sides, but as far as I can tell there are no marks or parasites.

My current water stats are as follows:

PH: 8.3
Temp: 79
Nitrite: undetectable
Amonia: between undetectable and 0.02
Nitrate: 50

The plant is heavily planted with java moss (accounting for the higher nitrate levels), and I recently added some extra bubblers, but everything else in the tank (including the fish) have been constant for about 2 months now. The only possible illness that may have been introduced was from a betta who had just completed treatment for popeye being in the tank for about 2 days after treatment was complete, while I located a new tank for him. This was over a month ago though, and none of the fish that died showed any signs of popeye...and the betta remains healthy. Also, I haven't detected any changes in any of the above water parameters in months.

The remaining fish all seem to be behaving normally, although a few seem to be spending a little more time swimming around the bottom part of the tank than usual-although swimming, not resting. I think its just because the more active fish (the male guppies) are now gone, although I am keeping an eye on it.

Any idea what is going on here or what I should do to prevent further losses? I have a bunch of baby guppies growing out right now who I plan to put into the tank when they are a little bigger so I am not so concerned about repopulating the tank as I am about stopping these deaths and making sure that the babies will be released into a healthy environment.

Thanks.
-Susie
 
I'm sorry to hear about your problem. Only problem i see is your very high pH and traces of ammonia. Did you Cycle your tank before adding any fish because Ammonia is very toxic to fish and ANY traces of it are lethal so don't take it lightly that alittle is present. How ammonia works is it suffocates the fish by preventing the fish to carry oxygen in it's blood, so death happens quick(within 4days) with hardly any physical signs. As for your pH, test your water source to compare how much your putting in your tank. If it is lower than 8.3, than it's possible to reduce that level because i don't know many fish that can with stand that strong pH. Either way, do a 30-50% water change to help reduce the ammonia and pH(if possible).
Besides that I hope someone else can help. :/
 
Could your gouramis be beating fish up? I see that they are dwarfs, but I've heard of a few nasty dwarf gouramis going after bettas before. It seems like they are the only ones not getting "assulted".
 
Could the gourami be causing problems? You bet. I had an opaline gourami boss a jack dempsey that was bigger then him around. Try seperating the gouramis from everything else and seeing if the problem continues.
 
sounds like the gouramis to me. i had to separate mine since they were trying to kill each other. now they are the masters of each of their tanks. very bossy, very territorial, and very aggressive. the only fish that will challenge my pleco who is 3 times bigger than him. BTW my gouramis are male blue dwarfs. also, they may have just decided to be nasty, when i first establishe dmy tank they got along peacefully with everyone else, for about a month or two. then things got ugly. sounds like a similar situation to yours.

:/
 
Thanks everyone.

I will look into the PH situation, althtough its been around 8.2-8.3 for months and this is the firist I've seen any problems. Same with the amonia. Most tests say there is no trace, but I did find one test that said that because of the high temp and PH even when it registers "no amonia" its really closer to .02. I haven't seen any labored breathing or anything, but maybe I will lower the temp a bit just to make sure.

As far as the gouramis-I'm sure they are responsible for the betta getting beat up, thats why he was removed. I probably wont be adding him back to the tank-instead I'm going to look for one of those 3 way octogon tanks so that my 3 bettas can play. However, typically I find the guppies beating up on them, not the other way around. One of them just went through a growth spurt, so generally I find them attacking each other now, but have not noticed problems with the other fish. I don't doubt, however, that my missing guppy may have been eaten by one of the gourami after he died. I do see them eating fry all the time, which is okay for population control, but a little depressing. Since I didn't see any marks on the dead fish's bodies I doubt it was an attack type situation, but I will keep a closer eye and perhaps corner them off if another death occurs.

Is there anyway of testing for a disease in my tank? In my mind I kinda feel that this might be the likely culpret, although the fish aren't showing any signs of illness. Also, is there any chance the nitrate levels are causing a problem? I keep the algae growth under control with cleanings and water changes, but since that number is a bit high I was wondering if it could be causing problems?

Thanks.
-Susie
 
There is no way of testing for a disease unless your friends with a vet or can do some chemestry. About the nitrates, if the levels are high enough, nitrate is posionous to fish. What are your nitrate levels?
 
The nitrate is at 50, is this high enough to be poisonous?
 
That's not too dangerous to be lethal.. I'm not so sure about your pH levels. Have you tested your tap water? You should get some nitrite testers, it could be from that...
 

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