Your tank looks very nice! Your pleco in the picture looks like mine which is a common pleco. They can grow over a foot. Escpecially since you have 2 of them (I assume both are the same species), they will probably become monsters in your tank knocking things over. You can try and trade them in if you like at your lfs. Many pond owners love the bigger plecos. If you decide to go this route, check out
http://www.planetcatfish.com and use the word bristlenose in a search. These plecos rarely get bigger than 6 inches, and some stay as small as 3 inches. When you find the fish you want, check on
http://www.aquabid.com on a regular basis for someone selling them possibly in your area, or you can always have them shipped. You can also check into seeing if there are local clubs in your area, and find out what the locals have for sale or trade. I love getting my fishies from local hobbyists. They are more special, and you know they were probably well taken care of.
Your tank is very pretty just the way it is! However, if the plecos become beasts in your tank, now you know what you can do about it. Of course the other option (and one we like a lot here), is to get a bigger tank in addition to the one you already have!
BBBWWWWAAAAAAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAH A
my friend gave it to me, I was going to get corys...sigh) has competely shredded several of my plants, now all thats left of them are little bits here and there
* And I love Cories too, I wish I could get some.