Anemones require a stable well aged tank, watch them closely if they die everything is history. And good lighting is necessary for nems as well.
At one month old your tank is going to exp. a lot of changes before it balances out. Mine took almost 1 yr. and now requires dosing due to coralline & stony coral growths so it never ends. Takes more then 1 month to grow all the different types of bacterias required to stabilize a tank not just the initial nitrifying types. Im even carbon dosing No-Pox to keep the nitrates at new salt water levels at 0.25
You are just barely at the initial testing point for anything beyond nitrites/ nitrates & ammonia . With the bioload in the tank id focus on ammonia/nitrite and nitrate next. ASAP like yesterday!
Water changes will cover Calcium, magnesium, and Alk and PH at the moment.
Good luck with the nems, clownfish are from the hardy damsel family so they may be ok. If you have a filter sock setup id be changing it daily, nothing good ever happens with quick overstocking on a marine setup, especially if its more then fish only, watch the clowns for a possible ick breakout also tho they would be about the last to get it due to heavy mucus coatings but it can happen since its a parasite & they may be under stress.
