if your mum is onto you, you might not be able to use an extractor as they can be quite loud, i got mine to be quite by having it inside then tent wrapped and zipped inside a thick coat then i wrapped bed sheets around it, not that i live with my mum but when people come round i dont want them asking questions to what the noise is.
i had the same size tent as you for one of my first operations and i just used 2 nice sized fans in there and kept the top unzipped to let heat out, i also used a 600 hps and the temps stayed around 75ish
for the leaning seedling push some soil around the stem and compress it a little (not to much dont hert her) so that it stables her upright
you shoud'nt need to water everyday as they are seedlings, remember your roots have a strong link to your overall harvest, roots will grow fastest when the soil is getting drier as they will have to search for the water, if you are watering everyday as a seedling the roots will never have to look far and wont grow as much as they could
are you going to get some nutes?