In my tank I have 2 rock caves I bought from the pet store about 2 years ago. Since then my 2 big parrot fish can't fit in them anymore. There to big lol. They try so hard to fit in them but they cant. So my question is what can I use to make 2 big, nice sized caves? Thanks
By the way the tank is 75gal.
By the way the tank is 75gal.