No clue about the possible fungus, but I'm sure there's someone out there with experience in dealing with those issues, and I try never to comment unless I am pretty certain. I live in the desert where it's much easier to dry soil out, than it is to keep them moist enough to cause problems.

Use nutes the same day they're mixed, and stir before use.

If you use the same components every time time you fertilize, your ph may be ok, but I'd have to verify before committing to that. Hard to ph the water after adding nutes, unless the nutes are clear. But it would really be nice to get an accurate runoff ph number. And I'm not sure which would win the ph battle of the ingredients over the long-haul...molasses or potash.