10g to 30g FOWLR

[nanoreefer]

well ive bin thinking a lot about my options on setting up this tank and i would like to set up a 55 but i know i wont have enugh after i get the PHs and more rock ect, the tank i was getting isent in the gratest shape but i may be getting another larger one(not sure on size but it comes with a stand)so i will see how that works out or i may have to buy one(i dought it though )ive also bin thinking about what i will be putting into it, i was thinking of getting a small trigger and seeing how i liked it and if i could keep up with the WCs ect and if i liked it set up a lager open tank for it, but is there any other fish, shrimp you can keep with a small trigger? how long would it take a nigger or undulated to get to full size? sence this will be FOWLR would it be ok to use my tap water(witch comes from a well)for it? and i have a laguna 384gph pond pump could i use it in salt water ?

thanks