napoleon wrasse queen

I have a 20 gallon freshwater tank with a bunch of fish and one cobalt blue lobster. It has a penguin bio-wheel 250 filter and all amonia,nitrate,nitrite levels are normal. I just did a 50% water change (about 3 weeks ago) and put in new plants and switched filters because the old one wasn't working. Ever since then my lobster has been on her side/hiding, but is still alive. At first I thought she was molting except it hasn't taken this long before. The only other odd thing is some of her legs are a little crooked and she is dark purple on her tail. I don't know what is wrong or what caused it. Is she sick because of stress or do I have copper in my water? Or is it something else? Any help would be great. Thanks so much!

Alessa

if you changed filters your tank is going trough a mini cycle...

when you say "normal" what are you exact readings?

test the water for the exact reading and do a 50% water change conditioning the water with prime...

Welcome to fishlore

Lucy

I don't know anything about lobsters but, as soon as I read you changed your filter, that's what I thought too.

napoleon wrasse queen

Thanks for all the help. Unfortunately she died about an hour ago. I thought she would of lasted a few more days. I guess the mini cycle was to much stress for her. I haven't tested it yet since I don't know how long her decomposing body was in there (I was out of the house) and I don't know how it effected the levels. I will test it later. Thanks again for all the help.

Alessa

no prob, sorry for your loss

do you have anything else in the tank?

napoleon wrasse queen

thanks.
In my tank I have:
4 Zebra Danioes
3 Serpae Tetras
3 Black Skirt Tetras
2 Honduran Red Points (they are babies, but growing rapidly)
3 Platys

Lucy

I'm sorry you lost your lobster, I wish I could have helped.

Alessa

yeah, just do 50% water changes daily with prime so that your fishies dont suffer and test the water...

Im sorry i couldnt help either