Is it true that the ph of a tank that just recently cycled will show a low ph alot of times due to not having any kind of photosynthesis going on in the tank? My tank is currently 3 weeks old showin 7.4-7.6 ph and has completed a fishless cycle. At this point there is no algae in the tank or anything yet. Should I wait for some algae to grow to see if it raises the ph or jump right to buying a scrubber? I live in an area where I cant really open my windows to air the room out or run a skimmer line to the outside.