Sick little girl... Need some help

I have been doing a hydro grow, Dutch passion blueberry. My ph is well controlled. I stay between 6.1 and 6.25. My temps are running between 24.5 c and 30... Normally right around 28.5 c. I am using sensi grow two part nutes and running at 900 ppm. She is roughly 40 days old. I have pics of the discoloration below.

Can anyone help?

Oh... yea... A 5 gallon water supply that have Ben changing weekly.

Hey, i may not be much help as new to hydro, but second pic looks like someone had a munch outta it. First pic the smaller leaves tips seem like the are starting to burn abity, but at 900ppm i think it good for just over a month old, im not sure what system you have but i think you ph is to high for hydro in veg stage,,, maybe that high at end of flower,, try 5.6-5.8 maybe,,, sorry not much help..

take it easy..

The one that looks like it had a bite taken out of it is why I am asking for help. I do a lot of research, but have not found any pics that look the same as what I am seeing. I think I have the ph right... I never read anything on hydro that said my ph should be that low..... You got me researching again now... : )

Looks like the start of a magnesium def.

When i said i bite outta it, it could be where the leaf has dried and then fallen out/off, but still could be a munch, if theres no more clear bug damage then i think you will be okay..
Speaking of bugs, have you sprayed owt on to the leaves? As in the first pic i think i can see dry residue on the leaves. Like thin white filaments,,could be my eyes.
Mg def is vaild, from that 2nd pic where the leaf seem to be ,but the 1st pic seems to be a trace def maybe zn,,,,maybe just up to 1000-1200ppm?
ph can be higher or lower for strain ,system ,nutes, etc. so that is your call. For me though 6.2 is the highest i would go, nd i would then even consider lowering it but thats me in my dripsystem so...
sorry kinda high and spittballing again..

Looked at 1st pic again and am going to say d.e was sprayed on them???? Wild guess i know.....

I have been giving it a spray of just ph controlled water with an atomizer about 30 minutes before the light go on each day... Trying to mimick morning dew... When I saw the hard water residue left behind, I stopped doing it. Good eyes!

i am going to clean my res and try going with a lower ph and raise the nutes a bit. I need to read up on my sensi grow nutes to see if it is adding mag or not.

You guys a giving me some great ideas to try.... I will let you know how it goes.... Oh... I do not have any bugs at all. Have not seen one.

The sensi grow is adding magnesium, but the ph levels I have been running at may not be conducive to mag absorption. From what just read, it does need to be lower... Like 5.8 - 5.9.

You guys are great! Thank you!!!

Yeah well that water must be quite hard to leave a residue like that,, but good news on the bug front.

Take it easy and happy grow and hope she comes right...