Why I can't pass anything to my html? Django 2.1

[Rookies DJ]

I been trying 2 weeks on trying to pass variables form Django views into 
html, but every time I run my code, it works but it doesn't display the 
variable I see 

from django.shortcuts import render
from zigview.models import tank_system

def index(request):
    return render(request,'FrounterWeb/includes.html')

def login(requset):
    return render(requset, 'FrounterWeb/login.html')


def timedex(requset):
    tank = tank_system.object.get(id(5))
    print(tank)
    return render(requset, "FrounterWeb/body.html",tank)


Here my models

from django.db import models


class user(models.Model):
    username = models.CharField(max_length=50)
    password = models.CharField(max_length=50)


class tank_system(models.Model):
    Ph = models.DecimalField(max_digits=2, decimal_places=1)
    EC = models.DecimalField(max_digits=2, decimal_places=1)
    temp = models.DecimalField(max_digits=2, decimal_places=0)
    level = models.IntegerField(primary_key=True, default=0)
    data = models.DateTimeField(auto_now=True)


Here my HTML that i try pass variable in 

<table align="right" style="width:80%">
<tr>
      <th>Time</th>
      <th>Tank level</th>
      <th>EC</th>
      <th>pH</th>
      <th>room temptures</th>
      <th>Water temptrure</th>
</tr>
<tr>
  <td>22.30</td>
  <td>900 lits</td>
  <td>{{tank}}</td>
  <td>7.3</td>
  <td>{{tank}}</td>
  <td>24</td>
</tr>

</table>


My HTML body structures

Web

├── templates
│   ├── index.hmtl
│   │   └── includes
│       ├── body.hml
│       ├── header.html

  This my urls files;

from django.contrib import admin
from django.urls import include, path
from django.views.generic.base import TemplateView

urlpatterns = [
    path(r'^admin/$', admin.site.urls),
    path('account', include('django.contrib.auth.urls')),
    path('', include('zigview.urls')),
    path(r'', TemplateView.as_view(template_name='index.html'), name = 'myapp'),
    ]

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