Reddit reviews Flyshop 2" ID 2-3/8" Drill Hole Grommets Synthetic Rubber Grommets Wire Protection,Hole Grommets, 4-Pack
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1.97"/50mm Inside Diameter, 2.36"/60mm Drill Hole, 2.76"/70mm Overall DiameterFlexible Synthetic Rubber, non-toxic and tastelessRun wires through frame, firewall, sheet metal and other applicationsKeep wires or any other materials from rubbing against metalPackage Includes : 4 Pcs x Rubber Grommets
So sorry to see ;(
They aren’t dead yet! Give them some tlc and they may recover fine.
Maybe some help to reduce algae growth:
Can you buy some plugs to put into the empty holes? We are using these rubber plugs to cover our water holes in our Kratky system.
You could also perhaps use cloning collars to block out the light.
And depending upon how thick the tubes are,
Could they be painted black?