I would go with the same advice everyone is giving you, 10% daily or every 2 days. Seems like your tank went through another cycle since you added uncured LR. For future reference, it is always better to add all the LR you will need when cycling and before adding any livestock. Well, it is not the best for a budget, but the best in order to avoid future problems with adding rock later. If it went through a small cycle then it will take time and you may see another brown algae bloom, very short. Really though it will balance itself out if you went through a cycle, it will just take time. I have to tell you the smaller the tank the harder it is to keep your water quality up. Avoid multiple bottles of additives and find a 2 part supplement of your liking, personally I use Oceans Blend. Last thing, Protein skimmers are great, make sure you get one especially if you plan on keeping fish. you could have done without, but only if you had a DSB.