disclaimer: noob grower, do not listen to below post:

light will get through that blue res wall. paint it black, then coat it 4 more times, then wrap it in black duct tape.

also clean and bleach the hell out of it.

i'd go buy your res worth of RO or Distilled water from the store too, it could be bad tap water.

Then for a few days it might be a good idea to add some H2O2 for a few days.

--edit, i just bumped an old unanswered post, oops.

sorry