Glow Tenticles

Use the Rectangular Marquee Tool to select a long rectangle then fill with white as below.

Rotate the canvas 90 degrees Apply Filter > Distort > Shear with the shape below rotate the canvas back 90 degrees the result should be similar to below.

using an eraser with the above settings erase the ends of the tenticle as shown

Duplicate the layer and position as required then hide the background and use layer > Merge Visible
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