Reach can be an issue with tall tanks. Mine is 30" and at 5'10" I can barely touch the substrate in center back, so I made this nifty gizmo to help place root tabs. It is simply a piece of wood (it floats!) drilled lengthwise plus a slightly smaller dowel. I tapered the end of the holder and then put a divot on the end of the dowel to help hold the tab in place.
Just place the tab in the hole with the dowel retracted, maneuver the whole thing onto the substrate and plunge the dowel which drives the tab as deep as you like. You could make this holder and dowel as long as you need to reach; just be sure to make the dowel longer than the holder for the plunging part.
Two minor technical notes: 1 - drill the hole significantly oversize compare to your dowel. Wood expands in water and you do not want to need any force. 2 - I drilled my hole from each end of the holder and naturally they did not meet exactly. A round file (or "rat tail" file) got in there and made the holes mesh just fine.
RAOK Club #76
220g altum, 75g high tech, 6g shrimp: one office, three tanks
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