Plants Dying

[Amber192419]

I bought a big bulk of about 20 plants about 3 weeks ago and bought plant food, within 4 days about 14 of my plants had died and had grown like fur on them! was horrible.

So i removed them straight away to prevent rises in water chemicals etc -

the other plants have lived and seem pretty well, so just unsure if its certain plants that live long or what? and need special water stats etc?

only features im wondering could of damaged some of the plants is..

1) could it be because the temperature of my water is higher, its about 30' 32'
2) tank doesnt have enough light throughout day?
3) my tank has only been set up for about just over a month so water wont be perfectly stable yet i doubt?

Any advice would be most appreciated because i love plants think they make a tank look great, and it feels such a waste when they die!

Thanks!