My brother-in-law gave me his old 29 gallon aquarium the other day, complete with gravel, filter, and power head.
The filter is a Penn Plex (I think I spelled that right) 150. It doesn't have a cover, so it is exposed to the outside environment. First, is this the right size filter for this? Second, is there a problem not having a cover?
As far as the power head goes, what exactly is the purpose of that? He said it's supposed to help with water circulation to improve filtration, but from what I've read, that's mostly for undergravel filters. The employee at my local fish store said it wasn't necessary to have one. The reason I bring this up is because no matter what I do, for the life of me, I can't keep it suctioned to the side, plus it's kinda busted, so I'm wondering if I need one. If I don't NEED one, is there any benefit to having one? And if I do get one, how do I know what size to get?
Also, anyone have any recommendations as far as what to stock it with? The owner of the fish store set me up yesterday with 3 giant danios (small) and 3 white clouds. My kids I think would appreciate a nice mix of colors, sizes (as much as possible) and such.