Sump for 700litre tank

[IanB]

Another hole is not, unfortunately, an option :blink:

However..
It's been a crazy day for this piece of kit.. seems every time I do anything to the tank I have to make a flow adjustment..

Added some more sand substrate (oh how I wish I'd run the 2nd bucket of the stuff through a few more times :wb: ) and done some planting..
Was worried about plants being uprooted in the night by the Gibbi (any sat on the overflow would restrict the flow, the pump would empty the sump, possibly overflowing the tank a bit, probably burn out, the heater would probably break in the dry sump and then the sump would re-fill blowing the fuses in the house) so I clamped the mesh part (strainer) of the uplift pipe (I'm still waiting for the connector to connect the uplift) to the overflow and almost immediately the whole thing settled down, no clamps on the pump outlet and the diverter open fully.

It's been settled now for about 8 hours.. there's about 1/2" too much water in the sump but I'm scared to touch it til the morning :yes:

I'd take a pic but that 2nd bucket of sand is still having an impact on visibility

 

[bigbird]

dont give up. you will love it at the end. cheers jk :thumbup:

 

[berwickdave]

my 5x3x21/2 is running standed 4ft tank as sump with 6500lph pump i am making a 4x18x18 sump to go with it my 4x2x2 i yesterday finshed a 3ft sump for that Heres a pic gtting 3500lph pump to run it

sorry about pic :thumbup::thumbup:

 

[IanB]

That is very cool..

I'm not going to give up, now that the levels been ok for about 20 hours I know I can stabilise it..

Bit miffed that the lph is low because of return pipework limits (would a flexi-hose allow more flow than solid? I can't see why it would but it appears that fitting the inlet strainer to the overflow has increased flow slightly so.. who knows)..

It's not disastrous though, I'm possibly going to be keeping angels and discus as mid-swimmers and they prefer a more gentle flow iirc...

 

[bigbird]

i also think that it plays a role, how low your sump pump is and distance to water outflow. Similar to a cannister filter. Lifting it up slightly will give it more output. I also do not think there is a difference betwenn flexible hose and firm. cheers jk :thumbup: