I have an Aqueon Quiet Flow Pro 50 gallons filters amazing water has always been crystal clear and I have had 0 fish die or become sick in the past 2 months I just recently began testing the water for ammonia and nitrates. Other than that everything else checks ok.25ppm can be lethal. Ammonia needs to be zero.
What kind of filter do you have? Ideally, you will keep your filter media as long as possible.
Also, consider doing water changes more often. Many people do weekly water changes. What is your stock?
With this set-up, Yos would need to do bigger than 50% twice a week.I would consider adding another filter. I don't think the current one will keep up. Generally I do a filter rated at 2x the aquarium size. You could add another filter and I think this would help. Or, do 25%-30% WC every 3-4days. The filter will keep the water clean but it may not have enough beneficial bacteria to deal with the bio load. The bio load is only going to get worse as the fish get bigger.
Thank you very much for the advice. The fish have been all in there since day one and as far as I can tell they have been getting along very well. No deaths or injuries to any of them. The zebras are probably about an inch long and yes I think they are zebra danios. The bala shark is the longest fish in there around 4 inches the rest of the fish are anywhere from 1 to 3 inches long. I have seen 0 fighting in the last 2 months except for sometimes they will chase each other but that's all never seen any injuries to any fish and they have actually gotten way healthier and more colorful since I bought them so my guess is i should probably upgrade to a bigger tank. I have a friend that has a 125 gallon for very cheap. I might look into that as well as purchasing a canister filter.I'm glad everything has worked so far, but, unfortunately, it's not going to last.
Is your zebra tetra possibly a zebra danio? What kind of algae eaters?
Your bala shark is the first issue. Not only is it a shoal fish that needs to be kept in a group of at least 5, they can grow up to a foot long. Plus it will eat almost everything in the tank.
The kissing gourami will get almost as big and eat the rest of your stock. All of the gourami will fight with each other.
Your barbs, danios, and rasboras are social and need to be kept in groups of at least 5, but really you cannot add fish right now.
There's also nowhere near enough in terms of hiding places from what I can see.
Your ammonia won't drop anytime soon, because you currently have nowhere near enough filtration.
Excess ammonia can cause the water to get really clear.
Sorry to be the bearer of bad news.