Our black marbled sailfin molly has suddenly twisted his back It was quite sudden. He was fine until another molly chased him in circles - then he came out wonky. Since then he has been stuck in an S shape He is feeding and swimming quite well. But is there anything we can do to help him to straighten out? Could something else be causing his bent spine?
Tank size: 84W x 44D x 59H (155 litres)
pH: 8.5
ammonia: 0.1
nitrite: <0.1
nitrate: 50
kH:
gH:
tank temp: 27C
Fish Symptoms (include full description including lesion, color, location, fish behavior): Black marbled sailfin molly with spine bent in S shape. Feeding normally and swimming reasonably well, but not fast.
Volume and Frequency of water changes: 155 litres, 40 litres taken out and changed each week
Chemical Additives or Media in your tank: None
Tank inhabitants: 3 x orange sailfin mollies (males), 1 x black marbled sailfin molly (male), 2 x sky blue dwarf gouramies (pair)
Recent additions to your tank (living or decoration): Added 2 x swordtails (male) 7th May; Added male sky blue dwarf gouramie 9th May; first swordtail died 11th May, second swordtail died 13th May - no obvious symptoms, just lay down and died. Water was fine.
Exposure to chemicals: None
Digital photo (include if possible):

Tank size: 84W x 44D x 59H (155 litres)
pH: 8.5
ammonia: 0.1
nitrite: <0.1
nitrate: 50
kH:
gH:
tank temp: 27C
Fish Symptoms (include full description including lesion, color, location, fish behavior): Black marbled sailfin molly with spine bent in S shape. Feeding normally and swimming reasonably well, but not fast.
Volume and Frequency of water changes: 155 litres, 40 litres taken out and changed each week
Chemical Additives or Media in your tank: None
Tank inhabitants: 3 x orange sailfin mollies (males), 1 x black marbled sailfin molly (male), 2 x sky blue dwarf gouramies (pair)
Recent additions to your tank (living or decoration): Added 2 x swordtails (male) 7th May; Added male sky blue dwarf gouramie 9th May; first swordtail died 11th May, second swordtail died 13th May - no obvious symptoms, just lay down and died. Water was fine.
Exposure to chemicals: None
Digital photo (include if possible):