Axolotl constipated/impacted and vomiting

I’ve had this rescue axolotl for a month and she has been improving daily, eats really well and loves to play in her bubbles. However last night she vomited a bunch of food up and then seemed fine. Then today we saw a little black spot on her bottom and it sucked back in and her butt began to float and she vomited again. The vet is closed until Tuesday and all the other vets I’ve called dont do axolotl care. History: she was in very very bad shape when we got her and had been housed in a 6 gallon tank with small gravel (see pic) she has pooped one diarrhea one normal and 2 rocks. She has been very active and thriving until last night. We got her a new bubbler and new large IAL she’s tubbed awaiting her tank to cycle. She is still wanting to eat as well. Should I fridge her?

what are you feeding her?
if she will eat let her eat
how bad are/were her gills, use 50% holtfreter with 0.1g magnesium sulphate per litre (info here.. Axolotls - Requirements & Water Conditions in Captivity ) to make the water more comfortable, make sure the water is oxygenated with an air-stone and kept cold, change water daily with dechlorinated water, unless she is floating uncontrollably or refusing to eat she shouldn't require fridging.

wolfen said:

what are you feeding her?
if she will eat let her eat
how bad are/were her gills, use 50% holtfreter with 0.1g magnesium sulphate per litre (info here.. Axolotls - Requirements & Water Conditions in Captivity ) to make the water more comfortable, make sure the water is oxygenated with an air-stone and kept cold, change water daily with dechlorinated water, unless she is floating uncontrollably or refusing to eat she shouldn't require fridging.

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Her gills are much better than a month ago. They were just little stumps before now they are fluffy and pink, she is a blue gill Lucy. I’m tubbing her with a hide and an air stone. She eats pellets she hates the invert pellets and will only eat A Lot’l axolotl brand pellets from Amazon, occasionally red wigglers and repashy grub pie and as a treat blood worms. She vomited again today and now is refusing to eat. She’s a bit less active today as well.

wolfen said:

what are you feeding her?
if she will eat let her eat
how bad are/were her gills, use 50% holtfreter with 0.1g magnesium sulphate per litre (info here.. Axolotls - Requirements & Water Conditions in Captivity ) to make the water more comfortable, make sure the water is oxygenated with an air-stone and kept cold, change water daily with dechlorinated water, unless she is floating uncontrollably or refusing to eat she shouldn't require fridging.

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Where can I find the things you recommended what is holtfreter and magnesium sulphate. Looks like I might need to make it and it seemed confusing to me

holtfreters solution is used in amphibian water to provide necessary salts and minerals, it has also been found to be effective against various issues such as fungus and anemla,
magnesium sulphate provides an essential mineral and can also help with slight constipation.
the ingredients for holtfreters is described in the link that was added previously although that is for 100% holtfreters, because of the small amounts used per litre it is easier to make it up as a larger batch amount. magnesium sulphate is also known as epsom salts. the ingredients for holtfreters is (at 50% added to one litre water) salt = 1.73g, potassium chloride = 0.025g, calcium chloride = 0.05g, bicarbonate of soda = 0.1g. as per the link there are modified solutions such as steinburgs and johns, johns solution can be used at 100% which is salt = 1g, magnesium sulphate = 0.1g, bicarbonate of soda = 0.1g, I wouldn't advise using steinburgs unless you are competent with chemicals as it involves the use of hydrochloric acid, there are solution that are stronger than holtfreters which are used with amphibians such as ARS (amphibian ringers solution) but these are normally used to treat conditions such as edema.