Blue Berry Help

I don't think you are having significant problems with the blueberries although I'd ease up on fertiliser as you don't want sappy growth - a bit of potash would be a good idea to encourage flowers & fruit:

- don't worry about the reddish leaves as it is probably the result of fresh tender leaf growth followed by a nip in the air (say a frost) but they survive and new growth will follow.
-  Not sure about the brown spots sorry, could just be scorch marks (droplets of water when the sun came out)
-  Insects are normal, we've had a mild winter so there is a significant number stirring now but so are the ladybirds too!  I haven't found blueberries to get too hammered by pests
-  Half eaten leaves may be due to birds, especially if there are flower buds - you could make a cage to keep birds out (but the mesh must be wide enough to allow bees in)

I think they look really healthy.  Mine look exactly the same with red leaves.  I really wouldn't worry as long as they are in ericaceous soil.  And rainwater is apparently best for watering them, I've always just used tap as mine are in containers.  They should get green as the weather warms up.

Chlorine isn't the problem (these are plants not fish LOL), it will be the pH of the water ... blueberries really do not like high pH (hence the ericaceous compost), and I'm inclined to think that in the south east as in your location, the tap water has a high pH.  You will need to acidify it - I'd recommend some iron sulfate (or recommended sulfur chips) on the soil surface so it acidifies the tap water when applied.

As for process - from the photos you have plenty of white flowers - bees pollinate, petals drop off, fruit swells and ripens (about June/July depending on the varieties)  The leaves will just continue to grow, get a darker green colour (ignore the red) more will appear and you should have a green bushy shrub with berries.  Blueberries do like a lot of water so water often especially during dry periods is essential - the more water, the bigger the size of the fruits.  In autumn, the leaves take on the most gorgeous autumn reds and then drop off.

What you will need to do is get some netting and make a cage to keep the birds out after the flowers have finished (don't forget you'll need access for bees until then)  Blackbirds especially LOVE blueberries and will strip your bushes clean once the berries start to ripen. 

Checked the PH today and it is at 5.0.
Fruit are doing okish.
Planning to place the net by next weekend..

The ants are still there but have put some cornflour (and cinammon)..