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very unsafe because of pump type. I have used 4 of those pumps for a diy hydroponics setup and had to scrap the pumps do to electric smell in the water and rusting inside the pumps do to the copper windings being exposed to water . a simple fix is use a peristaltic pump
or titanium rods that are very strong and will never corrode
not if you add titanium rods instead of easily eroded materials
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your coleus plant looks a little hurtin you should consider better soil or nutrients