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upgrade one at a time, and once u start upgrading higher level barraks u will need to be more conservative in ur elixers
important tip! do not use spells or expensive troops i.e, healers, avoid using several wizards, balloons, dragons, and pekkas. If u dont make enough than wat u spend, u'll obviously lose elixers and upgrading barracks will be very tedious :p
also please check out my post thanks :p
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Do not listen to him. upgrade and use every unit. they are all usefull within their own strategies every one of them. their is more to this game then barch.
maybe 80% of you'r attacks will be barch or bam for farming but be competent with every troop and experienced with every strategy. it makes the game alot funner and makes you a killer in clan wars. dont become a high lvl farmer who is an embarrasment in CW's.
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one at a time unless your other builders are going to be occupied for a while (ex teslas for 14 days), then you can do two at a time and take a quick break from clash