Growbed 2. Plumbing installed. 1" PVC with 1" flexible tube at bulkhead fitting to

Growbed 2.
Plumbing installed. 1" PVC with 1" flexible tube at bulkhead fitting to growbed. Water is raised from sump pump at bottom of fish tank to growbed 2, which overflows into standpipe and into growbed 1, which in turn overflows into standpipe and into fish tank.