Hey Brad,
To store FPJ at room temp, fully sugar saturating the solution is important. Usually, the 1:1 ratio used in the beginning to extract the FPJ before it ferments won’t be
enough sugar to preserve it at the end of the process, as otherwise you wouldn’t have gotten fermentation in the first place! So stir in sugar to the solution until crystals remain at the bottom, this way you know it’s supersaturated. Refrigerating will help you skip that step, but that’s not always practical!
As far as the fungal growth you’re seeing and whether it’s detrimental, a picture would help. White blooms on the surface are common towards the end of an FPJ’s shelf life, but in general any growth (or bubbling) indicates the FPJ is degrading or being consumed by microbiology. Mostly this is a problem because the biostimulants you’re trying to capture are pretty fragile.
Hope that’s helpful! The IMO process is a fun one as well, it can be pretty tricky to get the hang of without assistance or guidance from someone whos successfully done it! I’ve also had great luck just stirring IMO2 into a
compost extract right before watering it in. Making LIMO or IMO3/4 obviously propagates the microbes more, but a little goes a long way so don’t be scared to simply
water it in.