[pepper815]

how is this possible

 

[Geoff]

is there a picture of the back of one of those bio-cubes? looking to see where the holes would need to be drilled in order to do what you want.

G~

 

[pepper815]

well i want to try it without drillin

 

[Geoff]

not sure it could be done without drilling. adding an overflow box is the other option, but i am not sure how much room that would take out of the tank area.

G~

 

[pepper815]

i was just gonna make one out of pvc...like one of the diy ones

 

[Geoff]

the only reason not to drill is if the tank is made out of tempered glass. drilling is a lot easier than you think and makes for a cleaner overflow with less risk of siphon breakage.

G~

 

[aquawolf]

I also think you would have trouble trying to maintain the siphon since the back area is the filtration section and the water level may not stay constant back there.

 

[OneDummHikk]

i was just gonna make one out of pvc...like one of the diy ones

You could make a hangon if you don't mind removing the lid or altering it. There isn't a lot of room in the back section of a biocube so to have one of any size, it has to be external and with it external, you have two options:

1) Drill the tank (preferable if possible)
2) Hang on overflow box and that means modifying/removing the lid to the tank.