Habitable zone Gas Giant properties?
So I've recently decided that I want my world to orbit a gas giant. I've researched how the day/night cycle would work and all, and I'm pretty certain that my planet shouldn't be too wildly affected other than a pretty sky and a 30 minute "false night" every day as the gas planet eclipses the sun during noon.
Looking at Sudarsky's gas giant classification, I had hoped to find some information on the properties about the gas planet (i.e. it's colour, cloud formations, etc.) However despite this, the chart just so conveniently skips over what a gas giant resting within the -20 to 50 degree celsius range would be like. Do you guys have any answers to this? Would the planet have cloud formations? What colour would it be?
Another question regarding the moon, considering most moons are tidally locked, to accomplish a 30 hour day without having the world orbiting uncomfortably close to gas planet, would it be possible to simply decrease the size of the gas planet? Not so much as to make it impossibly small but perhaps around the size of Neptune as opposed to a Jupiter-sized planet. This way the orbit/day cycle time remains the same but the sky isn't entirely dominated by this gargantuan ominous sphere.