When ya top off your SW
tanks just do a kwik salinity check first. then try this:
Slap your nice full topoff bucket on top of your tank, on the light, against the wall, whatever. Take a few feet of airline tubing and stick it on a foot of rigid airline tubing.
Stick the rigid end of the tubing into the bucket. The weight of the rigid tubing will keep it in the bucket and tucked niceley in a corner where it will suck out the last drops -o- water.
Start the siphon, drop the output end of the tubing into the tank and walk away. Spit that water that's in your mouth now, into a nearby potted plant.
Your freshwater topoff water adds slooooowly to the tank. You can tie a knot in the output end of the tubing if you want to slow it down even more.
I dose my topoff water with kalk
and reef amino acids and minerals and stuff too. This way it adds sloowly too.
Hope that helps.