what kind of fish love to hide in hollow log decorations in aquariums

A single beta is the answer for you! Betas have may colors and there wide fins are very pretty to look at.

But, if a beta is not what your looking for try a gold fish or two. They will grow to the comfort of the tank. They're beginer fish, very easy to take care of.

However, make sure to have some kind of air pump. That is the same for any fish though.

well, for that tank size you can use a type of ''knife'' like the transparent knife or use catfish like a banjo catfish u might not see it as much but when it gets dark youll see it alright.

goldfish are fun to watch, and maybe a few minature gaurmi's, both of these fish would love to use this, those fish are smart, but do not put them together.

clown loach, other loaches, catfish. I would reccomend a panda catfish because they are very small and they places to hide. If its a 5 gallon tank you could probably get 2, 3 at the most because pandas are supposed to be kept in groups