I'm telling you... you NEED an overflow.
Let's say you put the hole below the water line on your siphons... When there's a power outtage, your siphons are no good anymore, that hole will have made sure of that (in order to avoid a flood in your sump)... But when your power comes back on, you'd have to be there at the exact moment ready to restart your siphon or else you'll end up with a burnt out pump. You may think that's easy enough, but when all this happens while you're away at work/school/etc. even just to the washroom, or if it happens at night while you're sleeping... you can't do anything about it.
Secondly, it may just take a while for the difference in flow rates to become apparent. You said you watched for a couple of hours and the water line was stable. Though I commend you for the effort it took to achieve that with just siphons and a pump, I can still guarantee you that given a long enough period, you WILL see a difference.
And if you've been away, as I stated above, and you don't see it... You could end up with a flooded sump and an empty aquarium (or a burnt out pump.)
Read my other post again. You NEED an overflow. Otherwise, the only other SAFE ways I can think of that would only use a pump and siphons are to either use a float switch or a set up a DIY canister filter.
Overflows are still simpler IMO.
Let's say you put the hole below the water line on your siphons... When there's a power outtage, your siphons are no good anymore, that hole will have made sure of that (in order to avoid a flood in your sump)... But when your power comes back on, you'd have to be there at the exact moment ready to restart your siphon or else you'll end up with a burnt out pump. You may think that's easy enough, but when all this happens while you're away at work/school/etc. even just to the washroom, or if it happens at night while you're sleeping... you can't do anything about it.
Secondly, it may just take a while for the difference in flow rates to become apparent. You said you watched for a couple of hours and the water line was stable. Though I commend you for the effort it took to achieve that with just siphons and a pump, I can still guarantee you that given a long enough period, you WILL see a difference.
And if you've been away, as I stated above, and you don't see it... You could end up with a flooded sump and an empty aquarium (or a burnt out pump.)
Read my other post again. You NEED an overflow. Otherwise, the only other SAFE ways I can think of that would only use a pump and siphons are to either use a float switch or a set up a DIY canister filter.
Overflows are still simpler IMO.
i think u might have a few probs in the near future with that type of setup matey 
