I tryed the "just put the pvc in the tank" methode over and over a few different ways and could only make it drain about 3/4 of a cup of water then quit .
BUT now I got a system that works SWEEEEEEEEETLY!
Here's what I did in case anyone else is interested.
After racking my brain tying to figure out an easy way to drain my tanks to help speed up water changes and cut down my work load. I got mad and stopped for a few minutes to put together some sponge filters,then the idea came to me.It was so simply I guess I just overlooked it.
After some tinkering and adjusting heres what I came up with in the end.
(see cheesey diagram below I'll try to post some pictures later)
Basically peices of pipe made into a U shape (upside down once in the tank) with an elbow on the end that sits in the water.I put an airstone down the section of pipe that sits inside the tank so it's suspended about 1 inch above the elbow.Where I drilled the hole for the airtubeing I slide in the tubeing then siliconed it to help keep this airtight to help the syphon effect work better.This placement of the airstone worked best.I used (tetra)fine bubble airstones because when I had the drain shut off,they seemed to cause alot less burping and water turbulance (but I also have it so the stones can be shut off) . Coarse or large bubble airstones made more burps,noise and water turbulance but offered no more flow to the drain.
I only used 1/2 pipe and to my amazement the flow seems AT LEAST double that of my python when used regulary but once I get everything done and tied in together I'll be adding a (airpowered/drawn) syphon with a threaded connection for my python- assuming I can make it work

(find out soon I guess)
_______!_
_______!_
1 1 1!1
1 1 1!1
1 1 1!1
1 1 1a1
1b1 L L
1 1
1 1
1 1
It basically looks like this with the 1's and _'s = pvc , !'s=airline, a=airstone,b=ballvalve
All the connections outside of the tank were made with pvc cement and any connections that inside the tank or may contact water that will be used in the tank are made with 100% silicon (without midew resistors or etc..)
I tryed this on a few different sized tanks and it works on them all even down 24 inches (your pump size will dictate how deep you can go though) so I'm happy with this set-up
The best thing is since it's airpowered if I forget about it for a minute and it drains to far there is NO parts to burn out or overheat!
And as long as my heaters and filter intakes are below the end of the syphon tube there should be NO risks or other problems! Since once the syphon tube is exposed to air our out of the water the vacume/syphon effect stops.
Another good thing is I can regulate and/or stop the syphon by either adjusting the valves in my airlines or by adjusting the ball valves in the drain tube.
And if I either forget or just get lazy and don't turn off the airlines since I used the fine airstones,they'll just help airate my water.
Now they'll all be connected to each other (by tees or angle 3 ways) and a long section of pvc (probally 1 1/2" so I can drain multiple tanks at once) that'll run directly to my floor drain.
Since it'll go right to my basement floor drain this thing
should be idiot proof!
It can't over flow,can't over drain,can't burn anything out and won't cause a flood - I guess I couldn't ask for anything more!
One less thing to worry about for those rare times I need to have someone watch my fish for me.
Now tommorw? an easier way to add water?
