Gymnocalycium is one that comes to mind. Usually the ribs between the spine are somewhat indented, but not always.
Ferocactus is another genus that often has large, but few spines. Many of the species have somewhat flattened spines.
Without a proper ID I would not put it in too hot a window, but bright light. Often even the full sun cacti are grown under shade cloth or in a greenhouse, and are not ready for full sun.
Allow the soil to get fairly dry between watering.
If you use any sort of house plant fertilizer I would cut the recipe in half, and only dose half as often (so 1/4 as much as most house plants). If you are using used aquarium water, then I would not use it every time. 1 time used aquarium water then 3 times use just tap water.
Ferocactus is another genus that often has large, but few spines. Many of the species have somewhat flattened spines.
Without a proper ID I would not put it in too hot a window, but bright light. Often even the full sun cacti are grown under shade cloth or in a greenhouse, and are not ready for full sun.
Allow the soil to get fairly dry between watering.
If you use any sort of house plant fertilizer I would cut the recipe in half, and only dose half as often (so 1/4 as much as most house plants). If you are using used aquarium water, then I would not use it every time. 1 time used aquarium water then 3 times use just tap water.
