Not So Happy Fish....

[HeatherW]

Hi,

2 of my fish are not doing well.
I think I may lose one of them.

One is a platy, the other a swordtail.
Both have slightly sunken bellies. Well, "flat" rather than "rounding down" to be precise.
Both have clamped dorsal and other fins (except the side ones they steer with.
One is eating. The other is not and is sitting on the gravel.

Water is fine.
Diet is varied with lots of plant material.
I'm confused.

Heather

 

[HeatherW]

Sorry,

Had to rush away before.
The tank is well planted and decorated, all artificial.
I do a 20% water change twice a week. I use a gravel siphon.
No other fish are symptomatic.
No observed bullying.
The feces appear normal in all fish.
Looks like stress, but I can't figure out why.
The one who is not eating is on the gravel "breathing" hard.
I do believe I'll lose her tonight, but I don't know what else to do.

Heather

 

[Lexie3787]

What are your water stats, other tank inhabitants, temp etc