Pseudotropheus sp. "acei" poses no problems when it comes to keeping it. The fish is peaceful and non-territiorial. The fish does need swimming space because it is open water. Pseudotropheus sp. "acei" is nice in the sense that it will swim in the upper two-thirds of the tank, which many mbuna won't do.
Cichlid | Acei Cichlid | Fish | Pinterest | Fur and Cichlids
That's not a bad idea, and one I'm seriously considering. Only problem is I have no clue if I will ever find either acei's or Jalo Reef's again. I lucked out with the Rusty's and Yellow Labs are everywhere. This weekend I will be in Guadalajara so I can check out a few fish stores. Hopefully one of them will have either one of those species. I'd love to find more Jalo Reefs. I'm 95% sure that's what that guy is. As he's feeling better he's getting quite bold with the markings and colors. Body turns almost aqua, stripes almost black and solid yellow top and back fin. So really pretty sure it's a young male Jalo. Pretty excited about him and hoping to find some girls. If so I do think I will swap out the Acei.
White Tail Acei (Pseudotropheus acei "ngara") | Tropical Fish Keeping
My guess would be that aggression killed your acei. That tank is really way too small for those fish--any level of aggression can turn up in injury and death simply because the fish have no where to go to evade the aggressor.
So I bought three fish that I thought appeared to be Acei
Pseudotropheus species are popular aquarium fish due to their beauty and fascinating behaviours. The genus Pseudotropheus belong to the Cichlidae family, and all Pseudotropheus species are Malawi cichlids. Some of the species that used to belong to the genus Pseudotropheus have today been moved and are today considered Maylandia / Metriaclima species. Malawi cichlids originate from Lake Malawi on the African continent; a lake famous for its diverse fauna and spectacular cichlids. Malawi cichlids are divided into two groups: Haplochromine cichlids (also known as Peacocks or simply “Haps”) and Mbuna cichlids. All the Pseudotropheus species are Mbunas, which means bottom dwellers in one of the local languages spoken around Lake Malawi. Among the most well known Pseudotropheus species kept by aquarists are the Yellow-tailed acei (Pseudotropheus acei), Powder Blue / Pindani (Pseudotropheus socolofi), Pseudotropheus demasoni, Pseudotropheus daktari and Pseudotropheus saulosi.
The genus Pseudotropheus is very diverse and it is always a good idea to do some more specified research regarding the particular Pseudotropheus species you intend to keep. All Pseudotropheus species do however have a lot in common, since they are all bottom dwelling Mbuna cichlids from the same African freshwater lake. They will all prefer a water temperature between 78 and 82° F and a pH value between 7.6 and 8.6.
The cichlids in Lake Malawi have developed to fit a large variety of ecological niches. The Pseudotropheus cichlids inhabit several regions of the lake, and have developed different colourations. The Pseudotropheus cichlids inhabiting Nkhata Bay and Bandawe are dark blue with yellow fins, while the Pseudotropheus cichlids from Eccles Reef are more lilac than blue. If you buy a more palely coloured Pseudotropheus cichlid, it is probably from Ruarwe or Senga Bay. A Yellow-tailed acei (Pseudotropheus acei) from Ngara or Karonga has white fins instead of yellow ones, and the body displays a pale blue colour.
Yellow-tailed acei (Pseudotropheus acei) is one of the most popular Pseudotropheus species among aquarists. It has an elongated body and shows very beautiful pastel colours. It is also easier to keep in aquariums than many other Pseudotropheus species, since it is comparatively docile. The average size of this fish is 10 centimetres (4 inches), and a 160 L (42 gallon) aquarium is large enough. Both male and female Pseudotropheus acei have striking colourations, but can be told apart by their size. A female Pseudotropheus acei is typically smaller than a male.
I picked up a trio of these fish in June (1M, 2F), and after a short quarantine period, introduced them to my 55 G African cichlid tank. At the time, tankmates included L. caeruleus, Hap. obliquidens, a common pleco, and boesemani rainbowfish. After living peacefully with the rainbowfish for a couple of months, I witnessed the male acei and the Hap. obliquidens both attack a female boesemani, killing her. Needless to say, the remaining rainbows were removed from that tank post haste. Since then, new tankmates have been added, including a juvenile Ps. Crabro and a Nimbochromis venustus and a trio of Synodontis eupterus catfish.