I am new to creating planted tanks but i just recently set up a 20g tank i have 3 anubias and some dwarf grass in there. It has no filter heater or ( water movment). It was setting for about 2 days then i added 3 cherry shrimp and 2 ghost shrimps and 1 snail. I let the acclimate to the water for a good time the after putting them in i noticed the snail and 1 of the ghost shrimps were dead, proably purchased like that. I have not tested the water yet but the other shrimps seem to be doing fine. well i have to add some sort of water movement or heater? Or would it be fine if i keep on building the eco system. Any ideas?