Is there anything bad about having two filters?

you have to clean both of them as apposed to just one :P

Are these two different kinds of filters?

Nancy

I have often, and at present I am using two filters in my tanks... it doesn't cause a problem and you could argue that its safer than using one big filter cuz if one packs in the other will still be working

Thanks, yes they are two different kinds, ones a wet dry the other is my protein skimmer, which doubles as a filter.(Only kind they had at the LFS)

Your two filters are the same as I have on my tank - a wet/dry (trickle) filter and a protein skimmer. Many octopus owners have this combination.

Nancy