deeunit1answered grow question 4 years ago They both do different things I think.Hydroguard is Mycorrhizal Fungi and Root XL is one wicked root stimulator that's only to be used for a few weeks.Iv got both,lol.but gone all organic now.The hydroguard should be keeping your roots all healthy.The nute company by far is Advanced Nutrients.I use their Voodoo Juice,makes your roots 200% bigger.DWC is a sensitive one.Temp,light,PH.How often do you change your food?They say weekly is best.Hydroguard feeding rate is per gallon.Are you sure its for DWC.I'd google my friend.It shouldn't be root rot with hydroguard.