Thanks for the replies, and sorry if the question didn't seem very concise, but I'd say it was answered perfect, that the leds will not interfere, also the bit on the normal state of the lines is very helpful, I kinda assumed they were held low with no activity, I'm currently designed a board with a 328p and I decided to throw in those leds as a troubleshoot helper since its going to be connected to a serial Bluetooth module which has no indication of activity
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