Whatās up @aussienewb! Welcome to the family.
Youāre babies are āhotā indeed, like the others stated! Good on ya that you transplanted. Canāt go without the pH-meter indeed. Itās your knife & fork. pH + EC- pen.
Read a bit about buffering coco and the importance of it. Hereās a little article, to get started.
Below some great tips for growing in coco from the Canna brand website:
Tips and tricks when using coco
1. Always invest in a good quality, well known brand of coco designed for soilless growing and donāt be fooled by the many inferior quality products on the market. While coco from different sources may look similar, there can be large differences in the quality and this can have a negative impact on plant growth. Coco products sold in garden stores and hardware outlets often as inexpensive compressed bricks of āgarden mulchā are not usually suitable for soilless growers ā these types of coco are typically high in sodium (an unwanted element), high in total salt content, often have not been fully decomposed, and hence have a high nitrogen draw down which can result in nitrogen deficiency even when the full strength nutrient solution is applied. Inferior coco products are also not ābufferedā, conditioned or pre-treated to stabilise the potassium levels and boost calcium which is required to offset the tendency of coco to retain calcium. They may also contain weed seeds and pathogens. Buying a reputable brand of coco for soilless growing is an important investment in the nutrition and health of the plants and also simplifies the process of growing a great crop.
2. Select the right nutrient product (i.e a specific coco nutrient product) to use on coco substrates. Coco growing media is not like many other soilless substrates such as rockwool which arrive pre sterilised, chemically inert with a low CEC and with a very minimal effect on the composition of the nutrient. Coco contains naturally occurring potassium which since potassium is a major plant nutrient, is considered a bonus; however this needs to be allowed for in the nutritional program of the plants. Coco also has other effects on the composition of the nutrient solution applied and levels of nitrate, phosphate, calcium, magnesium and iron may need to be adjusted to, allow for these properties. There are commercial brands of specific `coco nutrientā formulation products on the market, however it is always a good idea to select both the coco substrate and the coco nutrient of the same brand as it is likely they have been developed to work together and will give the best results. High quality coco products are likely to have been pre-treated and the accompanying coco nutrient will take this into account so that the ratio of elements in the root zone stays as optimal as possible.
3. Select the right type of coco product for the plants being grown. There are a large range of coco products on the market and many different grades with various horticultural uses. While orchids prefer a very coarse coco āchipā, using coco for propagation and germination of small seeds requires a much finer grade which will hold sufficient moisture as well as oxygen. General purpose coco which consists of a range of particle sizes is considered ideal for many plants and is the most widely used grade for soilless production. The coarser particles help the coco substrate remain more `openā to aeration while the finer particles hold moisture between irrigations and the combination of both these, is what gives coco close to optimum physical structure for plant growth.
4. Remember that coco is a `living substrateā and it should be treated as an entire eco-system which consists of beneficial microbes who make their home in the coco particles. This beneficial microbial life plays an important role in soilless systems as many fungi have a protectant effect on the plantās root system and have been proven to suppress plant pathogens as well as other possible benefits with nutrient uptake and plant growth. While other growing substrates start out as ster best left in its original state or even inoculated with populations of beneficial microbes such as Trichoderma. These populations of beneficial microbes in coco are to be encouraged and for that reason harsh sterilising chemicals such as chlorine bleach, hydrogen peroxide and even boiling water should not be used on coco substrates at any stage.
5. Coco usually maintains pH within an optimal range; however EC can build over time and should be checked from time to time, particularly under warm growing conditions where the plant may have been taking up a lot of water from the substrate, allowing the concentration of nutrients to climb. Because of the nature of coco growing media the EC around the plantās roots may be different to that in the leachate or the solution draining from the growing slabs, pots or bags. A quick and simple `extraction sample EC testā can be carried out on coco media to determine the actual EC around the root zone. For an extraction test, a small sample of coco is taken from the growing media, (several samples should be taken and combined to give a representative sample). Then 100ml of these combined samples is measured out (coco should be damp but not overly saturated). The 100ml sample of coco is placed in a jar and 150ml of deionised (or RO) water is added and the mixture shaken 50 times. This is allowed to sit overnight to allow extraction of nutrient ions in to the water. The resulting mix is then re shaken and filtered to remove particles and the pH and EC can be measured. The ideal pH range for the extract for most crops is between 5.5 ā 6.2. Ideal EC levels vary depending on the stage of plant development, the growing environment and the crop being grown, however a general range is between EC 1.0 and 2.5 (tomatoes may be grown at much higher EC values, particularly with commercial crops). Larger scale growers and those in commercial production will often have the coco extract sent of to a lab for a complete nutrient analysis which determines the levels and ratios of each of the elements in the nutrient solution so that fine tuning adjustments can be made.
6. While coco is a great growing substrate it still needs to be monitored and just as with other substrates, it is possible to over water and saturate the root zone. Coco can look slightly dry on the surface and still be fully moist in the root zone, so checking the moisture a few inches below the surface is recommended. Moisture should be present when the coco is squeezed between the fingers but the surface of the growing media should not appear to be wet - over damp coco can also attract fungus gnats as well as reducing the level of oxygenation in the root zone.
7. Coco is an environmentally friendly substrate and a fully renewable resource which can be used for more than one crop. However once its usable life is over it still makes a valuable soil mulch or soil conditioner for outdoor plants, and can be added to vermiculture (worm farm) and compost systems.
also have lowered the light a bit an moved fan to outside the tent and added a small oscillating fan in the corner
. Will also wait an hope for any other advice. Iāll head out today an pick up some bits 
thanks so much for your time man 
. Certainly all very valid points and deffinatley a good wake up call I needed. So I went an did some shopping todayā¦ Pulled my finger out so to speak haha an invested a bit more ā¦ I can only hope iv got in early enough to save them.
Need to finish a few grows, and get the Permanent Resident status still. The visa process is a long one.