[steve the plumb]

#1 Don't use Kitchen&Bath silicone
#2 Don't hook up a kalk reactor to a pump without using some type of controller along with a float switch or else when you come back from vacation finding out everything (or almost everything)might be dead
#3 Don't tell your wife what you spend on the tank(she doesn't need to know)
#4Don't let your wife read this
#5 Don't use any soap when washing filter socks
#6 Don't leave buckets lying around where someone else can use them to wash stuff,not tell you anything,and then fish don't eat and die!
#7 Don't let your in laws live with you while there house is being renovated(see rule #6)
#8 Try not to buy aggressive fish that may kill the fish you already have.
#9 dead live stock and corals can cause an ammonia spike witch will lead to other things dying.
#10 If you have Mh lights get a chiller
#11 Make sure when you go away you have someone who knows what he or she is doing to maintain your tank
#12 Don't overfeed unless you have a very powerful skimmer,even then nitrates and phosphates are a corals worst enemy.
#13 try to keep electric outlets away from splashing water unless you want to make your basement into a very expensive bonfire
#14 Cover your tank when switching out bulbs,some people have butter fingers and the bulbs break(Jnarowe knows this) and end up in the aquarium where you may not find all the pieces of the puzzle.They couldn't put Humpty Dumpty back together again,same goes for the lost bulbs

If I missed out the dew's and don't s someone can add to it