normally people add the base fert at the bottom, but since your substrate is mixed with base fert, i don't see how you can add any more without taking the old substrate out
fertiliser sticks to be inserted into the gravel are ok
liquid fert is to be avoided during the startup because the plants aren't fully developed, and algae is likely to take the fert and grow like wildfire
in your case that's more of an issue because you used a mix of base fert and gravel for your substrate, which could cause problems when the fert dissolves into the water
liquid fert will not hurt your fish, just to let you know
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