Predaplants is a very hardcore fusion deck. They fuse as extenders and fuse as final board presence. You can go all fusion only and have the albaz fusion on but you can also do a mix of links, synchro and fusions. There are even options to side in more cards if you want.
When searching predaplant cards, search predapruning if you can first, then some of the effect monsters, and use the pendulum link to search the scale you are missing. I tend to have 5 searches each time.
Not fusion locked tips: Odd-eyes synchron is easy enough to use to make baronne after you fuse the scales to make a random fusion and get the scale 8 back in hand. I also like to have a preda counter on the link monster since it alters levels unless you want that and that way you can summon back the level one from grave.
Fusion locked tips: Cards that locks you under fusion; branded fusion and predapractice. Always send the level one predaplant with the branded fusion. Then of course there is the preda counter strategy that is pure fusion strategy really. There are 5 fusion cards and lots of ways to get materials. My favorite searchable way to place counters is the trap predaplanning that can foolish the level one on your opponents turn for a search. I want to use necro fusion more but I do tend to have all my cards on board before needing it.