Ahh but what kind of bacteria?
Are you doing water changes or just topping off?
Great looking grow so far, I haven’t seen anyone use rice hauls before.
Just a thought but if you want to get more bang for your buck with your beneficial bacteria brew them for 2 days in some warm 70ish f dechlorinated water with a tablespoon of honey, molasses etc. I do mine in 5 gallon buckets and it only takes drops to half scoop of starting bacteria. Another bonus is the bacteria is activated and thriving when you put it in the system. 