i bought 2, 20mL bottles of D2 aquabase-100 test suspension, by DPHARM. i put one in the fridge for a day and kept the other in a cool dark place @ room temp. after i took out the bottle that was in the refrigerater it wasnt suspending near as much as the one that wasnt? even when i got it back to room temp and shook it well several times. but the one @ room temp is fine. any input would be a big help!!