PVC pipe works well, and is cheap too... I love going to home depot and grabbin a bunch of pieces of pvc.... the fish seem to love it too.. my pleco is always cleaning the pvc.
Plecs love PVC pipes, if you stack rocks around it you'll never see it and the plec will love you for it. Although if you don't want to use a pipe, just build a mound of rocks with plenty of holes and crevices through it, thats what I've done and both my sailfins love it.
what type of rocks can you put in the tank? I know aqaurium rocks but what other rocks can you add becuase i would love to get rid of some of the rocks outside in the yard! Would that be okay? Thanks!
It really depends on what sort of rock it is. If it's limestone for example it's no good as it'll affect the ph. I really wouldn't recommend using anything that hasn't come from a aquatic dealer.
Well, you could get limestone, but that is only for fish that like a alkaline pH.
Lava Rock is a good rock, it is acutally fake, but look pretty real...Granite is a good rock, Slate is a good rock, Gneiss is a good rock...Basically anything that is in the aquarium store that is a rock labeled something other than: "Limestone" or "Sandstone", is good.