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OrionX
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My tank size is 90cm x 31cm x 31cm. I had two 25mm holes drilled on the one small side (maked in green SIDE VIEW) on opposite corners. The side was fitted with a bulkhead and 25mm pipe for draining to a sump. I found this to gurgle quite alot, so i used an inline reducer near the top to 20mm into the sump(20mm pipe length = 50cm and 25mm pipe = 12cm), this somehow reduced the gurgling to nothing as well as using a bit of roughish filter wool, kinda like plastic pot scruber material.
The top most hole was used for inlet from a 1660l/h pump that sat in the sump, connected to 25mm pipe up to a bulkhead. The bulkhead then had a reducer to a 16mm rigid plastic pipe(IN GREEN ALL VIEWS did this as a 25mm pipe would not give me any pressure, and water just trickled in). I am not sure if i should make this into a spray bar or not, but for now i just bent the pipe using boiling water to almost just under water level leaving a bit of gap (for air in power failures so that the siponing action w