White stringy poop?

[teeneythebetta]

Housing
What size is your tank? 10 gallons
What temperature is your tank? 80 * F
Does your tank have a filter? Yes
Does your tank have an air stone or other type of aeration? no
Is your tank heated? Yes
What tank mates does your betta fish live with? 3 female bettas & 2 nerite snails

Food
What type of food do you feed your betta fish? Omega one pellets & blood worms
How often do you feed your betta fish? Pellets 2 x a day; bloodworms 2 x a week

Maintenance
How often do you perform a water change? Just started sorority, got OFL's okay to add girls while using tetra safe start. Currently testing water daily, daily to every other day changes
What percentage of the water do you change when you perform a water change? About 50% or as needed
What type of additives do you add to the water when you perform a water change? Tetra betta safe

Water Parameters:
Have you tested your water? If so, what are the following parameters?

Ammonia: .25
Nitrite:0
Nitrate:0
pH: forgot to write it down- I think it was around 6.8ish
Hardness:
Alkalinity:

Symptoms and Treatment
How has your betta fish's appearance changed? None except white stringy poop
How has your betta fish's behavior changed? She has been hiding but I believe it is because her and the others are hiding from the alpha- they're newly introduced.
When did you start noticing the symptoms? Today when I saw her pooping
Have you started treating your fish? If so, how? No she's still in the sorority. I am ordering another heater online for my smaller temporary tank.
Does your fish have any history of being ill? No, not since I've had her.
How old is your fish (approximately)? About 8-9 weeks according to online growth chart

Should I remove her? I dont have another heater yet- can I put her in a cup and float the cup in the tank so it stays warm?

[LebronTheBetta]

It means Internal Parasites. I suggest Jungle's Anti-Parasitic Food. Or any Medicated Foods.