Have you ever spawned any plecos before? If not, I suggest getting a pair of zebras may not be the best way to start. For one, a sexed pair will cost you a fair amount compared to unsexed or not mature. For two, can you positively sex them to insure you get one of each sex? And if they are a proven pair, figure a minimum cost of $500 and likely more.
I have been working with a few Hypancistrus now for about 8 years, they do require some knowledge, experience and above all patience.