The key for level 13-7 of DragonScales 3 is to form a way to access the pink scale on the left side at the bottom. Our approach starts by removing the rocks surrounding the central arrow, identified in Figure 1. Remember: to remove rocks just form combinations in adjacent cells.
After removing the rocks, activate the arrow (Figure 2.)
Now focus on the 2 adjacent arrows, on the top row (Figure 3). Activate one of them.
The next step is to activate the bomb to break the block (Figures 4 and 5).
Finally, activate the arrow to lower the column and get access to the pink scale (Figure 6.)
All that remains is capturing the cross pink scales and getting 80 scales of any color.