Am not sure what that stuff is on the water surface of your tank but it does happen on a lot of tanks, on one of mine included.
SOMETHING is stalling your cycle and quite honestly I do not know what it is.
pH at 7.6 is pretty spot on for cycling, the closer to 8.0 pH the faster the cycle.
As for water temp, should be around 24 to 28C (75 - 85F) , the lower the temp, the slower the bacteria growth will be.
Filter should be rippling the water surface and flow should be good.
The only thing I can think of is there may be something in your tank, i.e decor or even plants with pesticide treatment may be affecting the cycle.
We're missing something somewhere.....