P.S. Personally, I think the Eheim seem to do a better job cleaning the water but you'd want the biggest one you could get to get the power and ability to put as much as you need into them (like chemical filtration).
Normally called a siphon break. You want to make sure the hole is big enough that it will pull enough air in to stop a siphon. If the hole is to small, you do not get a good break. Lots of different ways to set those up.monicalovefish wrote:I've read that some people drill a small hole toward the top of their intake (still below the water level) to avoid having a disaster with an external filter. To be honest, I've never tried it but you could research it and see if someone has.
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