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Firstly, congrats on the baby!

Secondly, is she the only fish in the tank?

If so, I would go ahead and suggest doing 1 water change per week of 30% with gravel vacuuming. That will be sufficient for that size of a tank and not too heavy lifting for you. You can break it down to smaller ones multiple times a week if you need to- but continue to vacuum the gravel during the water change each time.
Adding water in the tank isn't considered a water change- to properly change the water you will want to vacuum the gravel as the filter you have won't remove the waste, but hides it in the gravel.

If you do decide to go for a sorority, make sure the tank is very densely planted, rearrange the tank prior to adding in the new girls- in fact, take out the one you have and cup her and float her with the new girls and release at once to avoid your current girl from becoming overly aggressive and territorial. It still may happen, but by rearranging, adding in tons of plants and taking her out/adding her in will help reduce the chance.
Make sure to have spare tanks, as a sorority can end at any time and all would need to be separated indefinitely.

For multiple fish in that tank, without live plants then 50% water change with gravel vacuuming once a week is needed- this too you can break down into multiple changes per week to add up to the 50%, vacuuming each time.
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