Yes. FFOF generally runs hot. It is really too young to look at colors to try and determine deficiencies - you shouldn't try to add nutes or anything to fix it at this point anyway. If you have the ability, try their "Happy Frog" soil. It is not as volatile, and already has mico's and microbes in it that benefit root growth.
If you thin the FFOF out with some plain peat (not the Miracle-no stuff 'with nutrients') and maybe some perlite it will fix most of that.
For about $70 you can get a RO filter setup that is rated at 50gpd, and is supposed to last a year at that 50gpd rate. I don't use 50 gallons in a month, so it should last a while
I did have to buy a pipe fitting to get it to hook up to a bathroom sink, but it comes ready to hook up to a garden hose.
https://www.amazon.com/dp/B00LKF09IW/?coliid=I7OC3BE992BJK&colid=2GEB3TZOJW2LZ&psc=0&ref_=lv_ov_lig_dp_it
My advice (opinion) is to ride it out until it is ready to transplant. You don't need to add much if any water at this point, and if you do it should be in milliliters, and just around the outside of the cup to make the roots find it. And NO NUTES! NO NUTES! NO NUTES! (get it? nukes? LOL)