Kribensis would do fine with those fish but you will need a bigger tank. You are going to have major aggression issues in that small a tank especially with the Aurutus. Peacock Cichlids get 5-6" and need at minimum a 55 gal
. 75gal is recommended.
Sunshine peacocks also might not do well with electric yellows the colors are so similar the peacock might think it is a competing male. If you have two sunshine peacock males together (not recommended) one will lighten his colors showing more grey as a way of showing he is backing down. An electric yellow cant do that.
You might want to do a pair of kribnesis and possibly add a few electric yellows. full grown electric yellow should be in 50 gallon.
Jewel cichlids is a tank mate that might do well with an aggressive kribensis.