Hair algae is developing in my dwarf seahorse tank. It is barely started but a single strand can tangle up a dwarf seahorse and they can't get free. Any tips to getting rid of this? Nitrate is around 10. I'm not sure about phosphate because my teat malfunctioned but shouldn't be very hight because I do frequent water changes. I can remove the decorations and clean them but it develops again the next day. And suggestions to kill it?