personally i think the albino tiger oscar would look good with the fish you have. Hopefully youhave a tank over 100gs. dont listen to Ghappy, he doesnt know what hes talkin about. Oscars are very aggressive south americans cichlids, just like all of the other large aggressive south american...
yup. Its clear glue type stuff thats called silicone. You can buy it at like lowes or home depot. But if its for a fish tank, be sure to get the aquarium friendly type. it ussaly comes in a little tube. I do not know of any other alternatives.
good luck