Just used these for the first time as my aquarium is quite heavily planted now and I thought it could use a little extra help.
Are they any good? And do I need to replace them at regular intervals, or will they last indefinitely?
Should I still use my liquid fertiliser as well?
Are they any good? And do I need to replace them at regular intervals, or will they last indefinitely?
Should I still use my liquid fertiliser as well?