i just found out i have Spirogyra in my tank. woo hoo!
i also just went through this thread and thought i would share what is happening with my tank.
i read somewhere that Spirogyra thrives in the same conditions plants do. so... i guess that sucks, lol.
anyway, about seven months ago i sent up my 1st planted tank(29g). eco complete substrate, 48 watts t5ho lighting, low flow fluval filter, and minimal ferts(just seachem nitrigen, phosphorous, and comprehensive + excel). add to mix some diy co2.
those first six months i experienced diatoms(badly, then went away), bga(which i managed to get rid of by using 'blue-green algae remover' and fixing some N and flow issues) and lastly, staghorn and maybe some bba(i think just staghorn - i had the two confused). never at any time did i have Spirogyra.
tore it down.
set it back up again with everything the same except this time i used aquasoil and am dosing potassium and iron (along with the before mentioned ferts.)
the only algae so far is Spirogyra and a little diatom which i was expecting at first. i am having some success with spot dosing excel.
so i guess what i should of learned here is that perhaps i'm dosing too much potassium and maybe iron?
all i can think of is stop dosing the potassium and iron and keep up the spot dosing with the excel.
What would Honey Badger do?