Question
I lost the tag for my plant but I can describe it very well, (it has long green leaves with pale green in the center and it grows in very low light). I have had this plant for 5 years and it has been growing great until I recently repotted it I did not use the usual soil and tried a new store brand two weeks later I had mushrooms growing like crazy, How do I get rid of them? and should I change the soil again?, I am scared to repot because the plant looks weak, and I am afraid it will die.

Answer
The mushrooms are the least of your problems, my friend. I suspect your 'very low light' is at least partly at the root -- if you'll excuse the expression -- of your problem.

Watering may be the other part.  I am wondering if you repotted because the plant was not doing well?  Or did the plant begin to wane AFTER you repotted?  Please advise.

You will find that many commercial potting soils are
based on organic ingredients.  Fungi are Saprophytes.  Saprophytes, you say?  Who needs to know this?  I'll tell you, my friend, this group of organisms are ALWAYS a key player in the decomposition process and if you don't know the name, you are already very familiar with them.  Mushrooms are the 'flower' of these Saprophytic Fungi.  They thrive in soil with a low pH, moisture and -- tada! -- low light.

It is understandable that anyone could become a little freaked out by peering into a pot they have a grown for 5 years and suddenly discovering a mushroom farm.  Mushrooms are unsightly.  And not always harmless.  Even I would consider them hazardous to pets and children.

As you suspect, it is POSSIBLE they arrived as a bonus feature in the new potting soil you purchased.  It is also possible that they just breezed in through an open window.  Believe it or not, these Fungus spores fly all over the place.  We have them in our lungs, they're up the street, on our hands, in the rug, literally they are everywhere.

My advice: Ease up on the moisture, raise the light level, and increase air circulation.  Adjusting the pH of this soil will also help destroy your mushroom farm.  Avoid coffee and coffee grounds; slight liming of the soil and a dryer, sandier growing medium will improve your odds.  If that doesn't work let me know and we'll discuss WMDs or other alternatives.

And please try to figure out what this thing is that you are growing.  'Long green leaves' covers hundreds of plants.  I would laso like to have a more detailed description of what you think looks sick about this plant.  Are they leaves getting paler, are they dropping, are they turning brown, wilting, etc...