Of course. Never hurts does it

Would be possible a alien rangers like the Aquitian rangers ?

At some point we'll see an alien Ranger or two but perhaps never an entire team of them. The Aquitian Ranger were bland and right now there's no American market for a extrarestial Power Ranger team.

What about another red ranger from another planet like Andros ?

Yeah, but Andros looked like a normal human. The Aquitar rangers looked different and had to be around pure water to keep from dropping dead. I think Galvantula meant non-human looking aliens won't be around for a while.

But they tried going to the public pool during that time Hydrohog sucked up all the water.

Still, they couldn't sustain themselves for long periods without a large source of water.
I would definitely be down for more alien rangers. So far, the closest we've gotten were SPD Shadow and Kat, but Shadow didn't morph super often while Kat only transformed once...
SPD was ripe with natural alien characters. I'm surprised none of the main ranger cast were aliens.

As in the core 5 right? Considering how Kruger was the mentor and also a Ranger and all.

Don't forget the Time Force Green. He was an alien.

Yeah. I never considered SPD Shadow as a main ranger since he generally operated alone and didn't morph super often.

Trip was an alien? Cool~