Hi I am a beginner at keeping cichlids I have had my tank set up for about 6 months now. I have not identified which types of cichlids. I have 10 cichlids, one cory cat, and a pleco. About a week or two ago I noticed some tiny black spots on a couple of my cichlids and a couple have some bigger black blotches on their scales. Is this some type of disease or is it nothing to worry about? I have them in a 30 gallon tank which I know is small but I am in the process of trying to find a bigger tank for them. I also exchange 25 percent of the water each week. I was feeding them Wardley flakes untill the pet store here in town discontinued it and I started feeding them Hikari pellets about 2-3 weeks ago and then I started noticing the black spots. The other day I went to a different town to buy more flake food for them and that is what I am feeding them now. I know this is alot to take in but like I said I am a beginner at this so any information or suggestions would be great! Thank you very much.