My 1st New Aquarium with DIY C02 for Hemianthus callitrichoides. Need advice

My gut feeling is that your tank is going to look amazing. Really well done.

 

Yes, I would switch from the bottled products and get some dry fertilizers and go the EI routine of dosing.

http://www.barrreport.com/co2-aquatic-plant-fertilization/3205-fertilizer-routines-one.html

Welcome to Planted Aquarium Fertilizer

It is much less expensive and easy to do, and is adjustable by a wide range.

It does require a weekly 50% water change.

It probably would not hurt you to do a few more water changes or a little more often. Esp with a newly setup and/or changed tank. You have a new substrate correct? If so, a weekly or bi-weekly for a few weeks is mandatory IMO/IME.

Congrats on the c02 tank purchase!

Tank is looking nice.