Close-ups of plants after 1 month of growing

Well it's nearly a month now, and I was hoping to have cucumbers on the plants and tomatoes - but of course part of the problem is that it's heating up- it's about 35 degrees during the day now and about 25-26 at night (celcius). No signs of flowering on the cucumber or beans and the tomatoes are quite small still.

Growth slow

Well, things are not growing as fast as I'd like them to. However, there is progress - the beans seem happy and the cucumbers are growing massive leaves. We will see if they ever bloom!

Trellises

I installed a few hanging ropes to help the plants grow up, that was missing. Yesterday I visited a farm in Aurov
ille that has started using Hydroponics for tomato cultivation - very interesting. He uses the normal method of two solutions that mix into a 100 liter barrel which he then drip irragates into his hydroponic containers. The containers are actually bags of coconut fiber that he punches holes into and plants the seedlings in. There is a drainage hole at the side of each bag. Water is fed in to the bag through a dripper several times a day.

Slowly Growing...

Here are a couple more pictures of the progress. Apparently beans normally flowers after 30 days, so we have about 10 days before we should see some flowers or figure out that the aquaponics system is missing some crucial elements.

Freshwater Test Kit Results

Now after nearly two weeks if waiting I received my freshwater aquarium test kit... It tests for pH, nitrate, nitrite and ammonia levels. The results so far are:
Ammonia : 0-0.1 ppm
Nitrite: 0 ppm
Nitrate: 0-3 ppm
pH: 7.6

This is the water that has been sitting in my ant channel that circulates around the house. The water is clear and has plenty of fish in it, it's developed its own ecosystem. I wonder if the nitrate levels are too low for the plants?

Here are some pics of the plants as they look today.

Seedling Still Growing

This post is just to show the latest pictures, after 3 days of growing. I was out of town and left the system on. When I got back the water was not flowing for some reason, probably an air bubble in the pipe. I would probably need to reposition the pipe (inlet) so no air bubbles form. The beans are really going for it, and the lettuce is starting to take shape slowly.

Seedlings Growing and a New Control System

Yesterday I completed the new aquaponics control system - basically the same as the old one but just in a nice enclosure. I'm planning to add two leds which will indicate whether water is flowing in or flowing out of the tank. This can easily be done with the analog input that I have from the float meter pot.
The bean is really taking off and the cucumbers seem to have settled in. Not having any prior growing experience, I was wondering how long it would take. It's now less than two weeks since we planted the bean seed, and it is already about 1 foot high. The lettuce is sprouting its second leaves and I have transplanted some of it from the sand to the gravel.
I think the gravel is too big and so the plants dont really manage to get a good roothold.