You will eventually want your own test kits if this is a hobby you want to stick with, you don't want to have to take samples to the store eveytime you want to check something. ph, amonia, nitrite and nitrate are the must haves. It is possible that the fish brought in an illness/were sick to begin with, but water quality should always be the first problem to eliminate, hence the need for your own test kits
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Also, new setups will sometimes develop some algae, that will often go away on its own. However, if you would like some algae eating fish you have options... otos are good, but can be a little sensitive. Some plecos get HUGE so you have to be very careful, but bristlenose plecs stay pretty small and are good algae eaters. Do you know what it was you bought before?
Also, new setups will sometimes develop some algae, that will often go away on its own. However, if you would like some algae eating fish you have options... otos are good, but can be a little sensitive. Some plecos get HUGE so you have to be very careful, but bristlenose plecs stay pretty small and are good algae eaters. Do you know what it was you bought before?