If its tight enough to not leak, you should be ok. No pressure after all. Gravity is your only issue. You could always run a bead of silicon around it for a bit of extra protection if you are worried.
Always secure your fittings (at least that's a rule at my place). It may be fine for ever unsecured but maybe not...... Either glue it in or if that is not possible put a sleeve over the join and use stainless hose clamps to lock each end in.
I would definately run a bead of silicone around that. There isn't a snowballs chance in hell that I would use a pressure fit hose at the base of my tank like that without something to insure it won't fall out or leak.
If the pressure fit end was on the sump side, that would be a different story but not on the hanging side. That hose will be heavy with water assuming there is any bends in the hose. Silicone that thing in!
I agree except that I would use a Union Ball Valve if there is room. It makes sump maintenance much easier. That way you can keep all the water in the tank just by closing a valve or 2.. I have union ball valves before and after every pump. I also have union ball valves on every drain and return line that way if I ever need to remove anything or add anything to my plumbing, is as simple as closing a valve and removing a union. Little things like that in the beginning make dealing with issues or changes down the line much easier. That said, my tank is pretty big and I have plenty of room for those in my plumbing.
Here are my drains.. Those are 2" union ball valves. I always use oversized valves and unions so as not to reduce the flow anywhere. I will typically go one size up from the plumbing and reduce down to fit the lines. In this case, my overflow lines were oversized to begin with.
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