| | Re: glutaraldehyde instead of excel
If you decide to use Excel/Glut I would start with the "normal dosing" level. Some moss species do not do well with Excel/glutaraldehyde (just like the Vallisneria and Ceratophyllum). I have lost moss species even when dosing Excel/glut even at the "normal dosing" level.
Have you tried other methods to deal with your hair algae? I find that if I reduce my lighting period, increase my 50% water changes to 2 or 3 times a week, and add a Siamese Algae Eater (Crossocheilus oblongus) I can usually get hair algae under control.