If you can swing it, just make things easier and get a larger humidifier. This is the one I use and it has no problem keeping up a 5x5 and has a large water capacity.
AIRCARE MA0800 Digital Whole-House Console-Style Evaporative Humidifier, White https://www.amazon.com/dp/B002AQUK9S/ref=cm_sw_r_cp_api_glt_fabc_JWRQDMRESEW3EQY5ZWM3?psc=1
Omg lol. Sry your comment was just funny.
What climate are you in? Is that in a tent outside? I hope you don't have cold winters. I'm going to be pretty much useless here, but maybe you could use a console humidifier. I use this one and it humidifies my entire 1400 sq ft apartment. In the winter I put it in my bedroom (~600 sq ft) and close the door and it's literally wet in there.
AIRCARE MA Whole-House Console-Style Evaporative Humidifier (Mini-Console) https://www.amazon.com/dp/B002AQUK9S/ref=cm_sw_r_apan_glt_fabc_4ZQ1DTZ2NF0HYM0PY2K7?_encoding=UTF8&psc=1
This is what I have.