How Often Should I...

Ok here’s how you do your water changes. Use a gravel vac to siphon out as much water as you need to (with your bioload 50-60% once a week is needed). Replace the water with fresh dechlorinated tap water that is the same temp as aquarium water. Your fish might be dieing from the stress of moving them around. Also, I have to ask, did you cycle your tank? If not click here

Second, I am not one to call overcrowding on anyone. It’s just not my style. That’s why you should take this advice to heart. DO NOT take it personally. Everyone here is only trying to help.

1. Nobody needs more than one pleco (each one of yours will get 14in long). Get one of the dwarf varieties or get a few otocinclus.

2. I’m pretty sure most of those sharks with the exception of the rainbow will outgrow your tank (each will be close to 1ft+ long!!). Pick one or at most two or three that you like best and return the rest.

3. That newt needs land! In nature and in my terrarium newts spend 95% of their time on land!

I'm curious if the same store sold you all those fish knowing your tank size? If so please name and shame that store for us.
 
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Mooman's advice is good. We are all here to learn so try not to think that we are picking on your tank stocking or anything. We all the the fishs' best interest at heart. At the very least I would not be replacing the dead fish you have had.
 
Rainbow Sharks

Just one small correction for mooman's posting. The Rainbow Sharks will only grow to about 5 inches long, not a foot. I do not know much about the other sharks, I would bet he is right about those.

Rainbows tend to dislike being around other sharks, whether of their own kind or similar, so if you want to avoid fighting, it is best to have one Rainbow with no other sharks.

While it is not a perfect measurement, the rule of thumb I read a lot of the time is to plan have one inch of fish per gallon, when they are full grown.

If you plan to keep the tank overstocked, an extra filter can be helpful along with the larger water changes.
 
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