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question about four 555 timers in parallel

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themikestar

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i have setup four of the following circuits to one power source www.ljgroup.com/techsupport/c_support/curric_update/ product/scantek/st140/us/1403_ds11.pdf
do i have to add diodes or something so they don't leech off each others 555 timers ??. they are all set ata fairly low duty cycle so you can see them flash, each cicuit has a trimpot to set the duty cyle and i guess thats the only thing making each one different (random) becuse i have each trimpot slightly different but sometimes i still get the same number on each diplay eg. 4 x 9, it's random so it is possibly but very unlikely, is there anyway of telling if they are leeching of each other ??.
 
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