https://amzn.to/2zWlR4G - Red Devil cichlids can be super aggressive. I highly advise you keep your fish well fed. One of my favorite foods is the Northfin Cichlid brand. Here is a link: Northfin Cichlid Food: https://amzn.to/2zWlR4G Additional talk: I do not get why people try and cycle with fish food. It takes so much longer since you have to wait for it to decay, it makes a huge mess, and you can't confirm the amount of ammonia you're dosing. I would DEFINITELY go with Dr. Tims Aquatics Ammonium Chloride listed above. Where I live, the water is very hard, what are your guys ways to getting it down? This is my 20 gal hex tanks reading for the day. None of the fish are weak or sick but I have always had hard water. Red Devil Cichlid Community tank. I have a new 90 gallon tank coming. I have sold my 60gallon community tank to a friend. I am unsure of what to stock my tank with. I really loved discus fish but I understand they can be a lot of work. I currently also have a 45gal tank with 8 african mbunas. Im debating on doing discus tank, a rainbow tank, south american, or moving my mbunas to the 90gallon. What are some things I should know about discus? What are some tank mates I can keep with discuss? Can I keep rainbows with them? What should I know about water parameters for them? I am newer to keeping Mbuna. I currently have (1) Bumblebee, (2) Red Zebra, (2) johanni, (1)melanochromis auratus, (1)Pindani, and (1)albino flame tip. So far they seem to get along but I am not sure if I have stocked correctly. What should I stock if I move the mauna to the 90gal? Thank you for your help! Tank pictures of 90gallons would help as well. Do you have any issues with your kh levels? Mine dropped from 6 to 0 in two days, with this substrate, I didn't want it that low as I have a snail. Just bought some better remineralising powder as I use ro water and a bit of tap water (tap has too much copper in it to keep snails unfortunately). Hoping today's water change will help. I know, was going it wouldn't do that otherwise it can crash the cycle in the filter as surely it would destabilise the pH so that could shift a lot and cause pH spikes? I had to upgrade to a bigger tank, I'd already bought the substrate, then I found out I had too much copper in tap water which is why I couldn't keep snails alive before, hence going ro route, the cycle from old sponge wasn't enough to see the new filter so suffered an ammonia spike and yesterday there was nitrite too, although this has gone today. But I'm worried it's because the kh is none existent, I've heard though it won't work for so long and it will probably all rise again but that would be months away, possibly a year, I don't know. I've hot cuttle bone in for the snail but he doesn't go near it and hasn't been in long enough to break down, as the tank is only about 11 days old.