Many are also capped with a piece of tissue paper, so the contents don't have any resistance in getting out (and it should withstand the lift charge if sufficiently saturated with paste)

Using a 3/4? tube aprox 1.5? long. Press a end disk with .15? center hole to a depth of .125? wrap a small length of visco in 3-5 turns of kraft (length depends on your viscos burn time). Cut and prime visco. Insert fuses 1/2 there length; using white glue fill the 1/8? inset (coat end disk and fuse). .5g 2fg makes a nice ejection charge, cut to length your flying fish (or falling leaf) bundle together and prime (the end of the bundle) with bp/nc slurry (you may wrap with tissue). Adding no more then 1g dragon eggs to every 3rd insert. press (don?t glue) other end with 3/4" cup set. Works nicely with fast firing cake of 100-150 shots.
Also pretty, make a 10 wide fan changing fish color every 2 tubes blue-> green -> silver -> red -> purple.
For a simple raising tail (best with fast fan cakes) apply D1 3/4" pumped stars (cored) over fuse then wrap 1-2 turns of kraft over full length of shell glue to hold D1 in place (any star comp will work, alternating rows 10-20 shots wide works nice)
Excuse spelling, working on my first cup of coffee
-cat