Check out this thread on GSH spawning.

http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=427356

Perhaps food for thought...

Flow thru spring water may be too cold to induce the GSH to spawn and will lack the tiny critters the new spawn will need to survive. IMO I would consider pumping your pond water thru the tank instead of the spring water. That should also eliminate the need to acclimate fish you want to transfer from the tank to the pond.

Last edited by Bill D.; 05/06/17 08:20 AM.

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