Vitalis Holiday Grazer Review

Hi all! I've just returned from a seven day holiday, and I'm glad to say all of my fish are non the wiser. I currently have:
8 Cory loxozonus
6 praecox rainbows
4 otocinclus - I grew algae for these separately
5 lemon tetra
In a 125l tank.
Before I left I did a 50% water change over two days (which put nitrates around 5ppm), and I put in a vitalis 7 day holiday grazer block. This is like a sucker on the glass which you attach a ring of food to. The ring cracked when I put it on but it didn't break up.
I put this in around 48 hours before I left so I could see if it would dissolve or muck up my water - which it didn't at all.
I've just returned, everyone's alive, and the water is perfect. Ammo nitrite 0 and Nitrates reading 10ppm.
Thanks for reading my review.

My ph is stable at 6.8 and didn't drop, I have soft water so if my ph is the same - as I understand it - my hardness hasn't been affected, although I don't test the hardness, just weekly water changes.

I just know I haven't had a pH crash so I'm happy about that! I also added a new piece of mopani though which I'd grew algae on for the Otto's and I know that can affect the pH but it was only a small piece. I only have the strip tests for hardness which aren't great.
Also this isn't a dry block, it's a moist ring of food you attach to a sucker. The pack says it's held together with a non dissolving gel, they feel a bit sweaty    haha so it's very non chalky but the fish have eaten it all up.

Yeah I think that's why it's good for seven days, then you'd obviously be doing a water change anyway. The grazer rings don't break up and decompose, I think the fish just nibble it as they want it - it doesn't release food over time.