Humidity problem

Hey guys, to make things easier, I would like to start with my setup
120x120x200 tent
600w HPS in a cool tube
100 mm inline fan
fan in the grow room
9 plants in 14l pots
So my problem is, I am soon to go flowering, but at night, humidity levels rise to 70%, which I know is not so good for the plants in flowering stage.
I now use 9l of water, while watering them each time(some say I should use 20 liters in later stage).
I am thinking in a long term, so wanted to ask You for advice, should I buy dehumidifier for my tent, or should I go for a larger inline fan, so there will be more air taken out ?
My future plan is to supply my tent with a good LED lights, and probably some CO2 bags for a better quality herbs.
Peace
Leo

What is your fresh air source, measured humidity?

I live on the island, so humidity is quite high here, I think it is around 50-60%

Doer said:

What is your fresh air source, measured humidity?

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Exactly this. Gonna be hard to drop your tent rh very much if you are replacing with moist air. 70% is kind of upper limit in my opinion, but certainly not a kiss of death, definitely doable.

Keep your air moving and fans on 24/7 with those kind of levels.

Circulation X 10! The kiss of death will come if you have temps dropping into the low 60's high 50's with that much moisture, otherwise you should be good. You could always burn sulfer as a precaution.

You can circulate the air all you want but it won't do squat to lower your humidity. You'll need a dehumidifier for that. Night time humidity spike is common even for folks running AC. It's the nature of the beast so best get used to it.

Just bite the bullet and budget for a dehumidifier. I have nearly the exact same readings in my basement without it running - 55% lights on and 75%+ lights off. Uses 330 watts for at least 18 hours a day and maintains a nice 42% RH.

i live in coastal terrain and humidity is quite similar to where you are, i really couldn't fight bud mold without a dehumidifier, i mean i actually tried hard to skip buying it, had 2 huge oscillating fans blowing a windstorm inside plant stalks shaking 24/7 and to my surprise, the insides of the huge top buds, were hit by mold severely. i only put it into action for the last 20 days of flowering when the buds are dense, but i leave it on 24/7, never seen mold ever since, except when i was late to kick it in...

Thanks guys for nice replies, so yeah, I have decided, I will be buying a dehumidifier, because it is not getting any better, and I want to water them more, so they would get more nutrients and ofc to have bigger buds.