http://puu.sh/aTwfF/baf1843483.png

they're all connected.

Working as intended:

• Tanks in some configurations will never fully drain - they won't try to balance with others if maximum possible change is equal to 1mB. It was done to prevent flickering and constant updates on almost empty tanks. Balancing algorithm is very simple and won't looks for lowest point in all connected tanks - it worked that way in previous version and it lagged terribly.
• Tanks will always render liquid if there is something in them. Otherwise seemingly empty tanks wouldn't accept new liquids.