Hello I have a bit of a nitrate problem (can't get it below 80ppm, despite multiple water changes), so I ordered an HOB refugium and will get some chaeto from the LFS. Questions I have are will it affect necessary algae growth that my algae blenny feeds on? Also, how much chaeto will I need? My tank is a 75 gallon FOWLR. It's been running well over 15 years and just recently traded in my predatory fishes to make it more of a peaceful community tank with smaller fishes.