Pregnant guppy grounded

[Familyfishny]

Hi folks,

This guppy has been obviously pregnant for some time, but hasn’t dropped any fry for several weeks. She’s been hiding in low flow places in the tank for a while, but is now grounded and struggling to lift off the tank floor/furniture. Two questions:
- Should I disturb her by cleaning the tank to improve water quality, or let the fish be for a couple days and see if she improves?
- Is this shape normal for a pregnant guppy? I don’t remember my other females getting this humpbacked.

Thank you!

Tank details:
37 gal, rocks and small live plant decoration, sand substrate
HOB filter, charcoal, filter fiber (the blue and white stuff you cut blocks of), sponge over intake
A:0?
Nitrite: 0
Nitrate: 0
Gh/Kh 180 last I checked?

8 guppies, 5 cories, 1 bristlenose pleco

Temp: 73F, just down after ~3 1/2 weeks at 86 for ich treatment. The guppy in question was the one with ich.

 

[MaloK]

I have often seen pregnant guppies with a slightly crooked spine... But this...

There must be something else... She should have given birth between 20 and 30 days.

 

[emeraldking]

Well, could you also show a photo of the gravid spot? For I'm not sure if she's really pregnant or that she's got an internal problem (that can show also a swollen belly).

There must be something else... She should have given birth between 20 and 30 days.

If a pregnant guppy doesn't feel comfortable enough, she can even hold on to those unborn fry for longer.

 

[Familyfishny]

Update. Any ideas?