ID needed

[CGY_Betta_Guy]

thanks for the quick IDs,
Hydroids and bryopsis eh. great. What would be the safe way that could be used to get rid of either of these? Read that raising magnesium levels would help with bryopsis and growing macro algae such as chaeto would assist in dropping phosphates etc from the water. I am sure my using tap water probably has a contributing factor too. I assume I will probably need to find a control for these before I start adding corals of any sort?