Need help 2 questions

[douglam]

first i need a suggestion on a moderate to high light and high flow coral. it is continuous flow to. it is coming form a nano Koralia on the far side of my 12 gallon. i dont want it to be an sps though i already have a few and dont want any more. and i cant change the flow because that is where the sps are. so i need some suggestions.

second
i have this layer of white stuff on the bottom of my 5 gallon water jug that i store my water it. i thought i might be salt or calicum but both tested out find so i dont think its those. any ideas

 

[TheMcs]

1 - find some shallow water zoas, probably going to be intense coloration

2 - when salt is mixing with water, there are several chemical reactions happening. Can't tell you what it is, but at the store I used to run, we had to tear down and scrub/powerwash the inside of the SW container about every 3 months. Nothing to worrk about though.