Sorry I only grow my heirloom tomatos from seeds, they grow true to form every time. I gather the seeds from the largest and best fruit.
Separate the seeds and put into a glass of water cover with a tissue and wait several days until the water goes a little mouldy, wash with clear water to get rid of any pulp remaining, dry the seeds on a tissue, and then save for the next planting.

Thanks for the reply.

I will look out for heirloom seeds. Might already be but will make sure next time.

I've also picked up something else that is interesting with this experiment. I started to get some algae growth within the containers (as expected) and thought it wise to treat the solution with H2O2 thinking that the extra dissolved oxygen will be beneficial and probably aid in the prevention of some fungal diseases. So I added a very small amount of the peroxide seeing that its the 40% one. About 5mil in one of the 25L containers. I started to notice the plant stressing out after about 30mins but perk back up as the hottest part of the day ended.

So my thought process for possible reasons. Correct me if I'm wrong (I'm a noob in horticulture).

1. The decomposition of the algae took more dissolved oxygen out than what the hydrogen peroxide could put in.

or

2. The plant experienced some shock due to a sudden increase in O2? (unlikely I think).

or

3. The H2O2 was not mix properly and some concentrated parts got into direct contact with the plant roots and whacked it a bit.

The other plants seemed ok with massive algae growth so I didn't treat them.
I might be misunderstanding the entire process and what effects algae have on plant roots and or the nutrients. We're told to get rid of it in hydroponics but I'm not sure why? The nutrients that they take up are surely released back when they die out? But I can understand if they suffocate the roots or create an imbalance that it should go.

Hope you guys might shed some light in regards to this.

Have a great day.

Cheers