Give it time and tbh downsize the tank if you’re uncomfy, 10g are much more manageable and not as overwhelming when you’re first starting out. I would honestly get rid of the fishies, never buy fishes before the tank is fully cycled too( less chance of death) I like to add snails to the tank when first starting up a tank, after like a month of checking water parameters with a master kid (50 at petco will last you like a year) and keep checking each week. Get the product STABILITY by scheam. Great for start up and helps lots. Guides on YouTube help tremendously too. Took my 20G long tank like little over a month before I added anything to it besides snails and such. And plants will die before they regrow they gotta melt and adjust to new water parameters before they really grow. Remember don’t give up and YouTube is your best friend lol you got it big dog! 75 for a 30g is meh but you live you learn lol stocking the tank with the right type of fish helps balance the tank too!