I know people buy glutaraldehyde in bulk like from amazon. Ive always used excel, right now im using API CO2 booster because I got it cheaper on amazon and it works just as good, smells the same. I had a few areas of black hair algae and used the API CO2 booster to spot treat and it killed it off no problem, just as good as excel has in the past. So ultimately its up to you which brand you buy. Ive also recently stared dosing trace nutrients, potassium, and iron in addition to comprehensive. I dose one comprehensive the day of a water change and then the potassium twice a week, iron once a week, trace twice a week. I was having some issues with new growth and it seems much better now. I am actually dosing glutaraldehyde twice a day also.
I dont know if this is a good schedule or not. I should probably get some test kits. I used to only dose comprehensive and use root tabs but when I moved started having issues with growth and I think its a water quality issue here. But anyway thats what ive been doing!
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