Sunnyspots
Fishaholic
Hello MarkIt’s all a bit advanced me for all of this. I was hoping to get fish in the tank by around the 10th July
That might be possible, although unlikely if you do a full cycle of your tank, which everyone is most likely to recommend. What you could do, although no-one would recommend it, is a 'fish-in cycle'. There are 3 big downsides.
1. It is unpleasant for the fish.
2. It limits what fish you could have.
3. If any fish die (and they will if you don't keep changing the water frequently) you might upset children involved in the project.
'Fish-in cycles' mean you can start by putting water treatment in the tap water (it clears it of chlorine) and then adding that, a filter, and a heater to the tank. Straight off. Once the temperature is right for your fish (you can buy a thermometer especially to check it) you could add just a few 'hardy ' fish (there is not a great choice of these, but they are less likely to die than others).
From then on you are trying to grow the useful bacteria using the fish waste - poo and pee - as food for them. Since any ammonia or nitrites in the water are poisonous for fish you must keep these down to zero on tests (don't worry, there will still be enough around to encourage bacteria). The best tests to begin come in multiple packs. You want at the very, very least ammonia, nitrite, and pH tests. To be sure you should really include GH and nitrate tests. And liquid test packs are best (don't bother with dipstick tests, they're pretty useless).
So now you have fish, but you want to keep them alive. Keep testing the water for ammonia and nitrites and aim to keep them at zero. To do this you'll need to change the water every few days - only about 20% of it or so - and that keeps the fish from swimming in too much of their poo and pee and dying.
After a while you'll find it is easy to keep levels at zero. Maybe a week will be fine between water changes. At that point you can add a few more 'hardy' fish and the process starts over again. Note every time you remove the 20% water from the tank you must use water treatment in the replacement tap water to get rid of chlorine or... dead fish.
It's hard work doing it this way rather that the no fish cycle.
Finally there is a planted cycle in which you use fast growing plants. There is a thread here on this. It is a bit of a halfway house, as long as you ultimately want live plants in your tank.
Finally, you can put in fish but change ALL the water EVERY DAY. You'd still need hardy fish and a heater and the 3 risks above still hold.
I think all that, and the fishless cycling, covers all options that minimise the risk of ending up with a tank of dead fish! Sorry that it really isn't what most of us envisage on buying a fish tank! I know I didn't!
I hope this is helpful.