水草情迷

About two days ago, a shrimp died which looked like internal bleeding, like this:



I didn't pay much attention to it, just hoped that its just an individual case. Today, I did a 1/3 water change after pruning 1/3 of my tank, after I filled up my tank and prepared to finish everything up, I found a wood shrimp lying on top of a plant, and have the same look as the shrimp died two days ago, internal bleeding near its brain, I have a photo of it, but its not as clear since wood shrimp darker in colour:



That's not the worst part, I counted 6 SAEs happily swiming together looking for dark places to hide for the night just after water change since I've delayed light off for 30 mins for all the triming and water change. A min later, I found one dead and stuck (not really stuck, i could get his body out easily) near between the tubing of the filter and glass wall, the weird thing is it also had internal bleeding, but not near the head this time, look like this:




I am really puzzled, I have also lost a Nannostomus espei for no reason a few days ago, it just lying there rotting, I didn't inspect him thoroughly, I thought nothing was special since he only had been my tank for less than a month. But now, I realized something might be happening in my tank. Any advice would be very very appreciated, I had these SAEs for two years now, I definitely don't want to loss another one due to my lack of knowledge, please help.

Thanks a million in advance!

I will take out all living creature from tank but leave some. Change all water and clean the canister. Give up your old filter media such as cotton, It seems some kind of element inside to made the organism bleeding. Keep observe the martyr.

BTW, have you did some special action?

have u check the water factor?? any change on NO2?
cause I have once replace some of the FRESH TAP WATER.. then my filter was totally destory.. NO2 increased very high.. then lost fish.

I guess they are infected by bacteria. OK, let search my little library at home to see if any luck. Sorry to hear the news.

Thanks for the replies. I got several replies from other boards and Usenet. Some said its probably not bacteria or parasite since shrimps and fish rarely share same sickness, while some suggested chemical I've put into the tank, some thought its my tap water. I didn't know who to buy, so I will just slow down, and observe, and do a bit of precaution measures.

I've observed another SAE (5 left in tank) was sleepless last night, and swiming against the glass wall all night looking for "exit", but other 5 were quite normal. So it might really be some kind of poisoning. However, I've also found something looks like weed seeds protected by some slimy transparent gel under my giant duckweeds, don't know what they are but surely don't look friendly...

So far, causaulty number reminds. As a precaution, I did carbon filtration for 12 hours, throw in some dechloriner which also neuturalize heavy metal, turned on UV for a couple of hours, fed some medicine for internal parasite and cut feeding & fertilizing by 1/2.

Actually, I am really suspecting my tap water, since I always aged my water without using neutralizer, and I had a few incidents after water change lately. I think I will start using dechloriner next time.

dechloriner really isn't the key point...

the most important is let the fresh water age, and there is also a change for the fresh water is lack of oxygen too.. by changing suck water... u know the result... things gone.. (My tank happened before also..)

hope u can soon find out what's wrong with ur tank..