Firstly, I’d try cutting down on both watering and fertilising.

Every two weeks is usually plenty in terms of watering – especially if you have high humidity. Check that the soil is at least partially dried out before watering. I wouldn’t fertilise any more than once a month and maybe don’t do it any more until you see new growth without brown spots.

If that doesn’t do the trick, it could be sunburn – make sure there aren’t any water droplets (or oil/pesticides) on the leaves that could exacerbate burning.

It’s also worth considering the soil mix they’re in – if it’s super dense it could be retaining too much water. Add a bit of perlite, orchid bark for drainage. Make sure there’s a drainage hole in the bottom of the pot, and that there are no rocks in the bottom that are causing a perched water table.

Hope this helps!

I’ve been fertilising once a fortnight/month since spring began last month, and water once a week. It’s been raining for the past fortnight though, and I have the humidifier running constantly, would this be why they have brown spots?

Yes, but I would add more soil to the bottom, rather than the top (take plant out, add layer of new soil, put plant back in) to encourage the roots to grow down, not up. This isn’t a big deal, but since the soil at the top dries out quickest, it means you can go longer between waterings.

The flying bugs sound like fungus gnats – they’re annoying but won’t damage your plant unless you have a huge infestation. If the brown stuff is crispy, then it’s less like.y to be something to worry about, though I can’t tell without a picture (feel free to email me). If it’s squishy then it sounds like rot and you need to remove the brown stuff and let it dry out.

If the brown stuff is on the petioles (the bit where the leaves meet the stem) it could just be the part that protected the leaf as it was growing – it naturally goes brown once the leaf is unfurled.