Ill Guppys

[bikerfish]

Tank size: 180 litres
pH: not sure
ammonia: 0
nitrite: 0
nitrate: not sure
kH:
gH:
tank temp: 27.2

Fish Symptoms (include full description including lesion, color, location, fish behavior) 4 guppys are staying on bottom of tank most of time , will come up for food then swim back down again. Swimming is ok so not swimbladder, not ick , scales are not cone shape , I have had them roughly a year , the other 2 guppys are fine at mo , there are no marks on the fish at all .

Volume and Frequency of water changes: I do a weekly water change of roughly 25% , stir substrate up weekly and clean plus clean substrate up in middle of week if needed . Filter fluval 306 cleaned monthly in tank water .

Added 3 small keyhole cichilds 3 weeks ago and they are ok nothing else added

I have 5 live plants in tank healthy

No pollutents got into tank

Rest of fish are healthy
Tank is fully cycled and has been for over a year

Could this be old age ?
Should I set up a quarantine tank ? but could have cycle issues with this if I do as not 1 up and running

Any ideas on this please

cheers cathy

Chemical Additives or Media in your tank:

Tank inhabitants:

Recent additions to your tank (living or decoration):

Exposure to chemicals

Sorry slightly filled it in wrong but all information is there
cathy

 

[bikerfish]

Hi me again I put my guppys in an emergency tank and they all were swimming around perfectly for a week , put them back in my big tank and 4 of them after a day starting staying on the bottom again.
Same water in emergency tank as in big tank and have tested water again and all is great , any idears please would be great , no signs of illness in tank so really baffled at this
cathy

 

[Nightstar99]

Hi me again I put my guppys in an emergency tank and they all were swimming around perfectly for a week , put them back in my big tank and 4 of them after a day starting staying on the bottom again.
Same water in emergency tank as in big tank and have tested water again and all is great , any idears please would be great , no signs of illness in tank so really baffled at this
cathy

Ph and nitrate are quite important, can you get a testing kit and check for abnormalities in those. I am finding guppies can be very fragile.

 

[turtlegirl]

Can you post exact water stats please

 

[bikerfish]

Hi will get a kit for them today, but it is a bit weird that they are doing it now as had them roughly a year and never changed how a do my weekly water change and the other 2 guppies are good as my little platy .
Will post them later cheers for answering
cathy