Test every 12 hours. Dose every 24 hours.
Undergravel filters have fallen out of favor recently, but they can be very good - providing that you do a very thorough gravel cleanup regularly. You don't need to clean the entire bottom area in one go, but you will want to make sure that the entire surface is thoroughly vacuumed about every month or so.
You have a fair amount of space available in that tank for some nice fish. You have space for about 45 inches of adult fish - assuming you stick to the smaller tropicals. I would start doing some research on the fish you really like. Mollies and platys are very nice fish to have. They require a hard water, which I believe you may already have. These fish will readily breed with NO effort from you whatsoever. All you need to do really is go to the store and buy a female of either species. Chances are high that the female you get will already be pregnant. Generally though, people get them at a ratio of 1 male to 2-3 females. These fish go well together. You can also mix in some guppies as well, which also breed ridiculously easily. Adding some floating plants as well as some mosses here and there will provide protection for the fry to hide out and survive. Many of them will be eaten, but a few will survive to maturity if you provide at least a little cover. The more cover you provide, the more will survive. If you actually pull the fry out when they are born and put them into a nursery tank, you will quickly be overrun!
Breeding other fish can take a little more effort - the amount of effort depends on the species and your normal water conditions. With livebearers the old axiom "just add water" really is about all you need to do! If I were you, I would just start doing a ton of research about all the possible fish for my tap water parameters and go with the ones that match and are compatible together.
Undergravel filters have fallen out of favor recently, but they can be very good - providing that you do a very thorough gravel cleanup regularly. You don't need to clean the entire bottom area in one go, but you will want to make sure that the entire surface is thoroughly vacuumed about every month or so.
You have a fair amount of space available in that tank for some nice fish. You have space for about 45 inches of adult fish - assuming you stick to the smaller tropicals. I would start doing some research on the fish you really like. Mollies and platys are very nice fish to have. They require a hard water, which I believe you may already have. These fish will readily breed with NO effort from you whatsoever. All you need to do really is go to the store and buy a female of either species. Chances are high that the female you get will already be pregnant. Generally though, people get them at a ratio of 1 male to 2-3 females. These fish go well together. You can also mix in some guppies as well, which also breed ridiculously easily. Adding some floating plants as well as some mosses here and there will provide protection for the fry to hide out and survive. Many of them will be eaten, but a few will survive to maturity if you provide at least a little cover. The more cover you provide, the more will survive. If you actually pull the fry out when they are born and put them into a nursery tank, you will quickly be overrun!
Breeding other fish can take a little more effort - the amount of effort depends on the species and your normal water conditions. With livebearers the old axiom "just add water" really is about all you need to do!
If I were you, I would just start doing a ton of research about all the possible fish for my tap water parameters and go with the ones that match and are compatible together.
