Hello, I have recently started my first hydro grow via dwc and have a few questions I'm hoping some one here will have the answers to.. I constructed my bubble bucket with step by step instructions I found here on this site.. The bucket works great so far.. I'm a lil over 2 weeks into the grow using foxfarm Grow big (hydro formula).. The clone has already grown 7 inches since I started it in the bucket and looks really healthy with great vigor.. However the problem I'm having is I change the res out and within 3 to 5 days I have to do it again do to a build up of what I can only asume is algae.. With every res change I have to rinse the build up off the roots and air stones.. I sent off for my ph tester and ph up & down but still haven't received them yet, So right now I'm using a paper ph tester with lemon juice to stabilize the ph.. I try to keep the ph at around 5.8 but its alil hard to do with lemon juice lol... I have foil tape around the whole bucket so I don't think any light is getting throw but I wrapped it again with the last res change 3 days ago just in case.. It still didn't help I checked it again today and it's starting to build on the air stones and roots.. Any advice would be appreciated..