You sure you mean Philodendron? Only that doesn't have 'red bits' - are you meaning Anthurium andreanum, which does have glossy leaves and, when purchased, red spathes?

OK you win. But I still will feed in March

If you can get it to flower again, you're a better man than me, gunga din... I chucked mine out after 3 years...

They're a tough plant to grow! I've only managed to get them to bloom in a whitewashed greenhouse--bright indirect light, and high humidity--with a 3-1-2 proportioned fertilizer. If you decide to chuck it, look for A. scherzerianum, or one of its hybrids, those are much more tolerant of houseplant conditions.

The leaves are glossy & nice so all year fresh green is there...no chance of going anywhere