New tank! specs = 90gallon(340 Litres) want some Constructive Criticisms Pic Included

From what I can see it looks like a pretty nice set up, but your pictures are too small. Is this a brand new tank or a new to you tank. The list of fish in your tank sounds to be okay but if your tank is a brand new tank then you need to watch your water parameters to ensure that the tank does not get "New Tank Syndrome". This is a rise in your ammonia which will cause stress to your fish. If it is an established tank...then you should be okay.

Good Luck and I look forward to see and hear more of your fish.

Fun size, just advice but you should read up on cycling a tank, there is a lot of info on these forums, but you need to go to the pet store and get ammonia and nitrite test kits because these are both toxic to fish, and will be present while your tank cycles. An easy way to knock down these levels temporarily is to do water changes, but the only permanent solution is a cycled tank which you will eventually get naturally. With that amount of fish I would do small water changes fairly often until the tank does finish cycling. You'll know when it finishes because your ammonia and nitrite will test 0.0 for several days in a row, then you should be able to cut back on water change, but will still need to do them about every week to 2 weeks. Sorry for the long post, just wanna help

Dustin

When you first get a tank, it is recommended by MOST of the people at the forum to get it totally ready for fish, but to not put fish in it. What I mean by that is that you get all the decor and the filters setup, and add the water, but no fish.
The reason for this is because there is a certain thing that happens with ALL aquariums, although I don't know why it does it. Anyways, it's called cycling. First, the ammonia rises up to an abnormal level,(I don't know exactly what the level is) ammonia being wastes from biological microbs in the water. After that, the ammonia lowers to almost 0 ppm, and the nitrIte spikes up, nitrite being the product of nitrifying bacteria turning the ammonia into their food. Then the nitrIte lowers, and the nitrAte slowly rises. This being because there in also a bacteria that eats nitrIte and turns it into nitrAte, nitrAte is less poisonous, but at high enough levels, it call also be deadly.
You can go to your local fish store (lfs) and get a "Master Test Kit", that includes all the things needed to test all of those three things.
After you know of the final NitrAte spike, you can put in you first fish.
Now, there are other factors that go into cycling, but since you seem new to fishkeeping (no offence, may have just been your mistake) I'm not going to go into those.
There is also fish-cycling, when you add a small amount of hardy fish to supplement the ammonia level, I don't reccomend it because it's, IMO, cruel.
http://www.aquariacentral.com/forums/showthread.php?s=&threadid=5927 that is a good thread on this site about fishless cycling.
If I'm wrong then tell me. Good luck with you new tank!!!

I think that there might be a difference in the water type required by some of the cats and the cichlids, and also that there are too many plecs, and that you may see a big-time problem with intraspecies aggression. The sharks may be too active for the rest of the tank, especially if the cichlids stay, because they will need rockwork out the *wazoo*, and this will be in the sharks' swimming path.