The goby usually only eats the very top layer, the layer you want cleaned. It will eat pods by chance, but it is the diatoms that you want gone that it
Prime is the best, I've found.
I had a lot of trouble with small heaters for my new betta bowl. I went through all five small ones from my local petsmart before I found an old ebo
That's a common thought since goldfish are typically vegetarian/omnivores, and being grazers, it's thought to be be better to feed them small amounts
How do you keep them from hurting each other? Just curious...