Sure.. you can use "hose"... (more typically called "tubing" for what you are referring to I believe) on any of the plumbing in a tank..
Note that typically tubing is more of a restriction than the equivalent pipe because the barb fitting necks down so that tubing can go over it.
You can also use "spa flex" hose which is basically flexible PVC..It glues into the same fittings as PVC pipe and allows some "flexibility"
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