I make gel food for my fish with agar agar instead of gelatin, and when I freeze and thaw it, the texture changes from a nice firm consistency to a really spongey one. My fish don't care in the least, but it does make it harder to cut up after its been frozen. My question is, does this happen to gel food made with gelatin too, or is it probably the agar that doesn't freeze well?

I haven't noticed that happening with my gel using gelatine, so yea... it probably is.

Thanks!

So where do you get agar?

and does it hold together well after freezing?

I remember using agar in petrie dishes back when I was a microbiology lab assistant doing work study back in college.

I get agar at health food stores. I use it because it's made from algae and is more like something goldfish would eat than beef gelatin. It holds together after its frozen, but it gets spongy, and if you squeeze it liquid comes out, just like a saturated sponge.

Interesting.

The algae vs beef thing makes sense. Any idea what kinda algae its made from?

Gelidium and Gracilaria.

pop into live chat now, we are discussing gel food.

Darn it! I was in the middle of rearranging my goldie tank.