Thank you so much for your appreciation, I always feared losing a fish every time I clean the aquarium. Don't know what I am doing wrong in changing the water - it happens to me (2) times now.

In response to your question - Yes, you can use the basic text formatting tags of HTML. On the other hand, you can also use Markdown Syntax.

• You can check this link for more information on Markdown - "Markdown Styling Guide".
• There are also many articles posted in SteemIt if you want to be familiarize with using either HTML or Markdown Language (e.g. Markdown & HTML Code Guide for Beginners that includes 5 Useful Tips to edit Posts & Comments using Steemit's Raw Editor; Edit & Align Text, Columns, Table and Smiley's).
• Yes, you can use some HTML tags in making your blog post.

Hope this help you in learning new language. Keep Steeming it will help you polish your skills.