Sharing with u another result:
- tested with a $2 plastic siphon pump - diameter of the suction tube: 1.5cm
1. flow rate result: about 800L/H max. with little of air-intake.
2. using a ehiem compact 1000, with abit of flow rate reduced. see pic.
3. water level inside the tank remained at desired level for 1 hr.
4. total cost: $2+$1.50+misc = about $4
Well, happy to get this result as I'm setting up for another new seahorse tank...
Let's try yourself!
Btw, anyone interested with my first product, a 2,500-3,500L/H DIYed plastic siphon pump, just for $5/- hehehe (no use lah...)