I've actually met Dave! He's a top bloke. I wish I could meet more folks on here, but you're all too far away
I actually made myself a member of a gardening forum yesterday and posed the question of whether aquarium water alone would suffice as a good all round fertiliser for houseplants.
I was amazed how many were actually hobbyists too! The general consensus amongst those guys was along the lines of what Dave was getting at.
Aquarium water is great, you can't beat it in some respects, but many of them believed, through experience, that certain aspects of the plants development fell short when just using aquarium water.
Flowers were mentioned as one of the main ones, hence like Dave said, the smaller than usual flowers on my anthurium.
Many of the guys on there who use aquarium water also supplement it with off the shelf commercial plant fertilisers to compensate for some of those other trace minerals that aquarium water may be lacking. Potassium and phosphurus particularly were mentioned as very important ones.
So I'm going to the garden centre tomorrow. I'll be buying a general fertiliser......and probably another plant!!!! Lol.