Your CO2 level is no good....DIY CO2? You would need to get the pH down to 6.6-6.7 during the lighting period for good growth. Tank size? Glosso needs high light..not sure how big is your tank though. JBL liquid fert is just traces, you would need macro nutrients as well...NO3,PO4,K,Mg,Ca.
For traces, I would prefer either Seachem Flourish or TMG as they cover wider range of nutrients and have proven to be good stuff.
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