T-5 bulbs range in wattage from 24 to 54 and can last up to two years. Unlike some types of high intensity lighting, T-5 bulbs are cooler running and do not require a fan. These bulbs are best suited for both reef tanks and a freshwater planted tank setup that are less than 24 inches deep. Personally, I prefer to use the T-5 lighting setup in my planted tanks.
1 Confirming the presence of your babyâs heartbeat. 2  You may have gone to your doctor with vaginal bleeding or you may be anxious because of problems in a previous pregnancy (such as miscarriage). 3  This ultrasound can routinely detect a heartbeat in your baby as early as 6-7 weeks. transvaginal ultrasound is usually required to see the baby at this stage of the pregnancy. Your baby is just a tiny embryo. Although the ultrasound may see your baby, it measures only a few millimetres long, and it is too early to always detect the babyâs heartbeat.
Most women first hear their baby's heartbeat during a routine checkup that uses the fetal Doppler early in their pregnancy. Many ultrasound machines also allow the heartbeat to be heard even before it can be heard with a handheld Doppler. Most women now get an ultrasound prior to 12 weeks.