Different Brand Batteries in Parallel

I run eight AMG batteries in parallel of mixed age and capacity... 105 and 110 amp hour without problems. I do check their voltage 24 hours after fully charging and seperating them once a year. As long as they are all within 0.1 volts of 12.7 do you really think I'll replace all eight batteries when one fails that test?:S
OP, if after a 24 hour rest after being fully charged and seperated they both test the same voltage... do not worry about it.