All tanks have enclosed lids..Only two tanks have two heaters operating..I know what happened to the other two heaters...All operated with sponge filters...Two tanks at the top level have plants in them...Four tanks have woods in them..I see the Prime bottle in front of me..I see scissors and glass at the back of one of the tanks as well..More airlines and connectors as well..More cute water spots..That sums up my observation.
What was that towel doing behind one of your tanks?
Nice set-up although I do have a couple of observations. I use a lot of Hydro sponge filters myself and your seriously cutting thier efficiancy by not driving them with air stones and by not using the lift tubes. The lift tubes should reach to about 2" below the normal water level of the tank for best operation.
Other than that...great job !! Nice use of available space.