Questions for best siphon

[Saieditc]

Hello I siphon water 15percentage every 2week
I change water from button tank and us difficult .can I change water from sump??
Are these ways differe??
Help me

 

[Saieditc]

I have 90 sps and lps and 20 fish

 

[Saieditc]

Another my question is is
I have Aqua medic 18w
How long enough for use uv?
For exp 1 hour in day or more or ...
Help me

 

[mfinn]

Hello I siphon water 15percentage every 2week
I change water from button tank and us difficult .can I change water from sump??
Are these ways differe??
Help me

I use a Python water change hose that will suck water from my sump.
I have also used a cheap wet/dry vac.