With Crystal tree can i get as many crystal beasts from my deck UP to the number of counters on it or am i forced to get the amount of crystal beasts equal to the counters?

Rulings from UDE:

CRYSTAL TREE
"Crystal Tree's" effect cannot be activated if you do not have enough "Crystal Beast" monsters remaining in your Deck. Example: If you have 4 Crystal Counters on "Crystal Tree" but only 3 "Crystal Beast" monsters remaining in your Deck, you cannot activate "Crystal Tree's" effect.

"Crystal Tree's" effect cannot be activated if you do not have enough open Spell and Trap Card Zone spaces for the "Crystal Beast" monsters that would be placed into your Spell and Trap Card Zone with "Crystal Tree's" effect. Example: If you have 4 Crystal Counters on "Crystal Tree" but only 2 open Spell and Trap Card Zone spaces, you cannot activate "Crystal Tree's" effect.

When a "Crystal Beast" monster is equipped to "Relinquished" with its effect, a Crystal Counter is placed onto "Crystal Tree".

Based on rulings 1 & 2 you must special summon Crystal Beasts equal to the exact number of counters on crystal tree.